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timofeeve [1]
3 years ago
8

The cell membrane is made up of _____.

Biology
1 answer:
castortr0y [4]3 years ago
4 0
The cell membrane is made up of "<span>a double layer of phospholipids"

In short, Your Answer would be Option D

Hope this helps!</span>
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Energy flow in an ecosystem is best represented by _______.
kondaur [170]
Answer: Pyramids of biomass
Pyramids of biomass display the weight of organisms at each level. Inverted pyramids of biomass can occur when the primary producer has a high turnover rate. Pyramids of energy are usually upright and are the best representation of energy flow and ecosystem structure.
Your question: Energy flow in an ecosystem is best represented by _______.
5 0
2 years ago
Which of these methods that aids in the movement of ions or molecules across a cell membrane requires the use of energy which is
olya-2409 [2.1K]

Answer:

D. Active transport.

Explanation:

Active transport is the method that uses the ATP's energy to move ions and molecules from one side to the other of the membrane. The elements move from a place of lower concentration to one of a higher concentration. They move against their concentration gradient, which is why they need the energy to do it. There are two types of active transport, primary and secondary.

The primary active transport is ion pumps that hydrolyze ATP using one of the phosphates of the ATP to change the pump's shape and move the elements against their concentration gradient. It uses the ATP's energy directly.

The secondary active transport does not use ATP directly. It uses the electrochemical gradient that the primary transport had created when hydrolyzing ATP to transport the ions and molecules.

6 0
3 years ago
Where on Earth would you find the greatest variety<br> of species?
cestrela7 [59]

Answer:

You would find the greatest variety of species in the tropics, and coral reefs. The Amazon basin in South America has the largest area of tropical forests where you could find the most variety of species.

Explanation:

5 0
3 years ago
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Select all that apply.<br> Atoms are made up of
vekshin1

Answer:

protons, neutrons, and electrons.

5 0
3 years ago
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The first step in treating drinking water, called ____________________, involves passing water through a series of screens.
AlekseyPX

The right answer is Filtration.

A water filter is composed of a filtration system that aims to separate the water from the solid particles (residues) by passing it through a porous medium, which allows only the liquids and the finer solid particles to pass through. as the filter holes (porosity). The water that comes out of this filtration system is rid of solid particles larger than the pores of the filter.

Some water filters are designed to make drinking water (very fine filtration, less than the size of a microbe).

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2 years ago
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