the price of a book is thrice that of an exercise book. of a student spend #9600 on book and #8000 on exercise book, he has 56 items altogether:
(a) what is the price of an exercise book?
(b) what is the difference between the price of a book and an exercise book?

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Answer:

sperm and the hormone testosterone.

Explanation:

Sperms and hormone testosterone are produced by Testes.

A testicle, which is pronounced "teh-stuh-kl," is a component of the anatomy of men and those who are born male . You typically have two testicles. These organs produce hormones and sperm.

Male gonads or testes (pronounced "teh-steez") are other names for your testicles. A testis is a single testicle.

The temperature of your testicles is roughly two degrees Celsius lower than the rest of your body. Spermatogenesis, the production of sperm, benefits from cooler temperatures.

Therefore, Sperms and hormone testosterone are produced by Testes.

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Answer:

1. cellular communication

Explanation:

The correct option is - 1. cellular communication

Answer: B

Explanation:

Answer:

The mitochondrial gene tree suggests a later split because it occurred hybridization later in time, with the transference of the brown bear mitochondrial genetic information to the polar bear population. So the mitochondrial gene tree exhibits a later divergence.

Because the first divergence event of the common ancestor occurred 60,000 years ago, evidenced by nuclear DNI and mitochondrial DNI. However, 100,000 years ago, concerning the mitochondrial genetic material, the hybridization event defined a new more recent common ancestor between the two species.

Explanation:

The use of mitochondrial DNA might present a few problems that need to be considered in evolution studies. It involves only one locus, so it has some limitations when reconstructing history, especially if the locus went through any process, such as natural selection, bottleneck events, or its transference to another population due to hybridization. There is also a high possibility of an incomplete reconstruction of the population history if males and females have different dispersal patterns.

The most proper way of reconstructing history is by complementing mitochondrial information with nuclear genetic information and evaluating their concordancies.

In the exposed example, 600,000 years ago, the original species split into the polar bear and the brown bear. But 100,000 years ago, hybridization occurred between a brown bear female and a polar bear male. The offspring joined the polar bear population, carrying the female genetic information, nuclear and mitochondrial. With time, these individuals interbred with the polar bears, diluting the nuclear brown bear genetic information. However, females carrying the brown bear mitochondrial DNI seemed to be more successful reproductively than the polar bear females. The mitochondrial information, hence, has been in the population for many generations, until today. And this information came from a more recent common ancestor, compared with nuclear genetic information.

Francesco Redi showed that microorganisms are present in air thereby disproving the idea of spontaneous generation and is denoted as option B.

This is supposed production of living organisms from non living substances.

The jar was left open and had maggots in it means the flies laid their eggs which later turned to the maggot which was what Redi observed during the experiment.

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Answer:

6.2 million acres in crops

Explanation:

Hope I helped, have a nice day!

Answer:

Hydra

Explanation:

The correct answer is - Hydra

Reason -

Budding: Hydra reproduce asexually through budding, where a bud forms that develops into an adult and breaks away from the main body.

Answer: Chemical change

Explanation:

Because the body of the Praying Mantis is hotter than the water so it makes it "melt" into water vapor that will soon evaporate.

Answer:

Fires often remove alien plants that compete with native species for nutrients and space, and remove undergrowth, which allows sunlight to reach the forest floor, thereby supporting the growth of native species

Answer:

Most nonrenewable resources are formed from organic carbon material which is heated and compressed over time, changing their form into crude oil or natural gas. The term nonrenewable resource also refers to minerals and metals from the earth, such as gold, silver, and iron.

Answer:

all of them can cause pollution

Explanation:

The slowest one is the one that goes up and down the least the fastest is the one that goes up and down the most i dont know how to explain it hopefully this helps

Answer:

A. to review meaning

Explanation:

To review meaning are both prereading and postreading strategies used.

Before attentively reading a text (or a chapter of a text) from beginning to end, pre-reading is the process of scanning the material to identify essential concepts. sometimes known as surveying or previewing.

Pre-reading gives you an overview, which can help you read more quickly and effectively. Examining (and considering) chapter titles, summaries, headings, subheadings, study questions, and conclusions are typical pre-reading activities.

Students can use pre-reading tactics to anticipate what they will read or hear by considering what they already know about a particular topic. Teachers can focus on a book's organization, teach new vocabulary or other concepts, look for the primary idea, and provide students a reason for reading or listening before they even begin to read any material.

Therefore, To review meaning are both prereading and postreading strategies used.

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Answer:

if i were you I would write about the Nile river because it's supposed to be one of the biggest rivers and if u would I would look more about it on what it says but not the exact words ok.

Explanation:

have a good day sorry if this didn't help

Answer:

Trust me i feel u  and understand so heres my answer so that u can feel at ease

Explanation:

Food- Most Ag animals, (Such as farm animals) Are mainly a source of food. This role is vital to my life and everyone else because Food is one of the major things we need for life. This item is produced through farming and Manufacturing. The main contributors to this would be Cows, Sheep, Pigs and Chicken.

Clothing- Some animals fur or Wool can be used as a type of base material for clothing. This Role is vital to my life and everyone else because Clothing is one of the major things we need for life. This item is produced through Shearing, Hunting and/or Manufacturing. The main contributors would be Sheep, but sometimes game animals (such as bears or deer) are used too

Milk- Cows and Some goats Makes milk. This is an important role because Milk is used in a variety of foods such as Cakes, Cereal, Oatmeal, etc. The main contributor would be Cows, however some times Goats milk can be used as well. Milk is mainly processed through pasteurization

Pets- Some animals (cats, dogs, birds, etc.) Can be used as Pets. This role is important because Pets are Stress relievers and can help mentally with what could go on around the world. Most pets are breed through selective breeding. The main contributors are Cats, Dogs and Fish.

Butter- Animal fat can be used to make butter. This is a important role because butter is also used in a variety of foods, such as cakes, Meats, etc. Animal fat left over from butchering animals can be process into butter. Most ag animals that are used for meat, (cows pigs) are used. A second way to make butter would be to use goats milk.

Answer:

0,75 l

Explanation:

1 l = 1000 ml

0,75 l = 750 ml

Answer:

The wooly Mammoth is a animal that was once tried to be revived and it is very rare to find

Explanation:

Answer:

5-14 Miles

Explanation:

Took the test and that was the correct answer

Answer:

Wegener is not qualified to propose theories in the fields of geology and the history of the Earth because there was no mechanism available to endorse his proposals and offer a convincing and truthful explanation, hence the rejection of the Continental Drift, the theory That made him famous.

Explanation:

Wegener is not qualified to propose theories in the fields of geology and the history of the Earth because there was no mechanism available to endorse his proposals and offer a convincing and truthful explanation, hence the rejection of the Continental Drift, the theory that made him famous.

The north pole has been known as the northernmost point present on earth, and on the other hand south pole has been known as the southernmost part or the point of the earth. The area present in  between south pole and north pole has been said that it has been extremely cold and the area present near the equator has extremely hot.

The area of north pole has not the part of any country or the north pole does not lie in any country. The main reason of the coldness of the north pole and south pole has that they do not receive any direct sunlight. The best time to visit the north pole has the time of June and July because in this month the ice of the north pole is thinner as compared to other months.

Therefore, Wegener is not qualified to propose theories in the fields of geology and the history of the Earth because there was no mechanism available to endorse his proposals and offer a convincing and truthful explanation, hence the rejection of the Continental Drift, the theory that made him famous.

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Answer:

Lizards are experts in thermoregulation and are able to maintain an ideal body temperature most of the time. Lizards hibernate in winter if the weather is too cold for them to reach the required body temperature.

Explanation:

reptiles regulate their body temperature through what is called thermoregulating . simply put this means basking in a warm area to heat up and moving to a cool are to cool down ..... reptiles hibernate in winter if the weather is too cold for them to reach the required they body temparature

Answer: Plants that always produce the same traits as their parents when they are self pollinated

Mendel used self-pollination in pea plants to grow true-breeding plants for his experiments. When a true-breeding plant self-pollinates, its offspring all have the same traits as the parent. For example, a true-breeding plant with purple flowers always has offspring with purple flowers.

HOPE THIS HELPS

Answer:

not sure what exactly it is, but here is some info:

Explanation:

A food web shows what eats what (typically a single line from animal to animal), a food chain shows the whole ecosystem (typically with intersecting lines and a lot of organisms).

Answer:

Height of the Foshay tower is 138 m

Explanation:

Using the third equation of uniformly-accelerated motion under gravity:

v² = u² + 2gh

Where v is final velocity,

u is initial velocity,

g is acceleration due to gravity,

and h is height

v = 52 m/s;

u = 0 (since the marble was dropped from rest at a height above the ground);

g = 9.8 m/s²,

h = ?

(52 m/s)² = 0 + 2 × 9.8 m/s² × h

2704 m²/s² = 19.6 m/s² × h

h = 2704 m²/s² / 19.6 m/s²

h = 138 m

Therefore, height of the Foshay tower is 138 m

Answer:

Creationism says that organisms presence is due to the supernatural acts of divine creations.

Explanation:

The concept of creationism is against the teachings of natural selection and fitness because in the concept of creationism, the presence of organisms occurs due to the supernatural acts of divine creations which rejects the concept of natural selection. In natural selection, the best suited organisms in the particular environment due to high compatibility with environmental conditions and those that are not compatible will extinct from the ecosystem.

Answer:

A and C

Explanation: