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Ivenika [448]
3 years ago
11

Pls help I need help ASAP THANK YOU​

Biology
1 answer:
vivado [14]3 years ago
6 0

Answer:

C,A,D,B.

Explanation:

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A forest is cut down to make room for a housing development. Which population is most likely to survive?
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A because they can eat out of the trash where the others require thenforest to live. Hope this helped.
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In 1998, scientists discovered that the expansion of the universe has been accelerating.
KengaRu [80]

Answer:

Option A (dark energy) is the right answer.

Explanation:

  • A hypothetical supplier of power that creates a force that contradicts gravity, which is assumed to have been the catalyst of accelerated universe development.
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Some other three choices have no relation to the particular situation. Thus option A would be the right solution.

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3 years ago
Once a neuron is stimulated and the membrane potential is depolarized, the depolarized axonal membrane is helped to return to it
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Answer:

Explanation:

The cell membrane separates the cell from the outer environment. The extracellular fluid contains the sodium ions (Na+), chloride ions (Cl-), while intracellular fluid contains potassium (K +) and negative anions.

The potential difference arises when the membrane is selectively permeable to some ions. The resting potential is -70mV.  

When the neurons get excited, the sodium ions start to enter by sodium channels.  

Now there are more positive ions inside the cell membrane. It disturbs the resting potential i.e. -70mV. This stage is known as depolarization.

When the inside environment of the cell is more positively charged, the potassium ions start to move out of the cell. It goes out by the voltage-gated channels. Thus resting stage is maintained and it is known as repolarization.

But the initial stability of the cell membrane has to be maintained. To restore the resting stage, the sodium ions start to move out of the membrane and potassium ions enter into the cells again. This is an active transport and has done by the Na+ - K+ pump. Here 3 sodium ions move out and 2  potassium ions pumped into the cell through the plasma membrane.  

Thus the resting potential regains. The potassium ions come back into the cells against the concentration gradient and ATP provides the energy for this phenomena.

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3 years ago
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A star produces energy by:
LenaWriter [7]

Answer:C. Creating helium from hydrogen in its core

Explanation: Stars produce energy majorly by nuclear fusion. The process of creating helium by merging hydrogen atoms to produce deuterium which in turn is converted to helium.

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What is it called when a molecule moves across a semipermeable membrane into a region of higher concentration?
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Its actaully active transport
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