BIOLOGY HIGH SCHOOL

Which soil layers comprise the topsoil?

Answers

Answer 1
Answer:

Answer:

A-Horizon and O-Horizon.

Explanation:

O-Horizon is the top layer of the soil made up almost entirely by decomposed organic matter. A-Horizon its found below and is where the seeds germinate, it is made of hummus combined with mineral particles.

The topsoil has the highest concentration of organic matter and is where Earth´s biological activity occurs.

I hope this answer helps you.
Answer 2
Answer: A Horizon and O Horizon 

Hope This Helps, :)

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Which of the following is NOT true about energy balance? A. Energy balance is influenced by the amount of exercise one gets and their dietary habits. B. Inactive people use more energy so they should consume fewer calories. C. Stored body fat will increase if calorie intake is greater than energy used. D. Energy balance is the balance between the amount of calories consumed and the amount used for energy.

Water is a solvent because it

Answers

water is a solvent because it is capable of dissolving a variety of different substances that is why it is called good solvent 
Water is also called universal solvent because it dissolves more substances than any other liquid

When determining the taxon based on morphology, a scientist is relying on genetic similarities.True

False

Answers

The answer is true. In morphology, the scientist relies on genetic similarities in determining taxon based. Morphology is the branch of science which deals with the study of structure and form of organisms and also the organism’s specific structural features.

A company estimates its total profit (profit = total revenue minus total cost) as P(x) = 2x5 − 3x4 − 5x2 − 2, where P is in thousands of dollars and x is the number of years elapsed since the company was founded.Solve for the number of times the total profit become exactly zero. Hint: Use Descartes's rule of signs.

Answers

   Using the Descartes` rule of signs, we have to recognize how many times the signs change from positive to negative, or from negative to positive from one term to the next. There is only 1 change of signs: from +2 x5  to -3 x4. So we have only 1 real zero.
   Answer: There is only one time that the total profit become exactly zero.

4.
______ describes the average conditions of our atmosphere over a long period
of time.

Answers

Answer:

The answer is Climate.
Answer: climate


Explanation: weather is what conditions of the atmosphere are over a short period of time, and CLIMATE is how the atmosphere “behaves” over relatively long periods of time.

According to the text, the growing demand for African slaves during the slave trade era motivated African leader toA. migrate large populations of people inland away from coastal threats by the shores.

B. initiate attacks of rival tribes in order to profit by selling captured Africans to the Europeans.

C. establish peaceful relationships wih the Europeans out of fear.

D. pay the Europeans lots of money to avoid becoming colonized.

Answers

The answer is B. Since slavery was introduced to the West Coast of Africa in the 1600s, it became a thriving trade that spurred the industrial revolution. The trans-Atlantic slave trade was used to put slaves on the farms in the Americas. The African leaders benefitted from the sale of Africans as slaves. Powerful kingdoms hence raided weaker tribes to capture slaves for sale to the Europeans.  
According to the text, the growing demand for African slaves during the slave trade era motivated African leader to initiate attacks of rival tribes in order to profit by selling captured Africans to the Europeans. The correct option among all the options that are given in the question is the second option or option "B". 

How does the contractile vacuole in a single-celled organism function to maintain homeostasis?a. It pumps water into the cell.
b.It pumps water out of the cell.
c.It pumps solutes into the cell.
d.It pumps solutes out of the cell.

Answers

Answer: "Option B- It pumps water out of the cell".

Explanation:

Vacuoles in the cell organism are responsible to maintain the amount of water in the cell body, to get stable in the environment vacuoles either  remove or absorb the water through the mechanism of osmosis or osmoregulation.

Homeostasis is the phenomenon of maintaining balance of physical and chemical conditions of organism according to the environmental conditions to survive in it.

In single celled organisms, contractile vacuole pumps out the water from the cell through osmoregulation and excess of water is pumped out by the contractile vacuole.      
It's b. When placed in a freshwater environment, the organism is in a hypotonic solution, so water would flow into the organism. To prevent from bursting the vacuole constantly pumps water out to make up for this.
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