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jenyasd209 [6]
2 years ago
7

Where does the process of chemical digestion begins?

Biology
2 answers:
fenix001 [56]2 years ago
4 0
It begins in the mouth. You produce saliva when you chew. This helps break down the food so it can get down to your stomach.
poizon [28]2 years ago
4 0

Answer:D. Mouth

Explanation:

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If a human or a prey animal is out and about at night, they are more at risk of being eaten. if the prey are in a safe place sle
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Some of the organisms have evolved in such a way that they remain inactive when the predator populations are active.  

Adaptive theory of sleep suggests that the prey population prefer to sleep when (in this case, at night) the predators are most active. The prey population use this time in taking rest and restoring energy for other works. As the prey population is inactive and remained protected in safe places, they are less likely to be predated.  

Hence, the correct answer is adaptive theory of sleeping.  


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3 years ago
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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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The theory of evolution describes
Leni [432]
The correct answer to your question is the last one; how species change over time.
Hope that helps!
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Do single celled and multicellular organisms both get rid of waste
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Yes, while multicellular organisms remove waste through the urinary system, single celled organisms expel their metabolic waste with vacuoles 
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