Answer:
El óvulo (o gameto femenino) es la célula más grande del organismo humano, que fecundada por un espermatozoide dará lugar a un embrión.
Explanation:
Is say B it may be C though
Answer:
The answer is Norepinephrine.
Explanation:
Acetylcholine (Ach) and Norepinephrine (NE) are both chemical substances (neurotransmitters) released primarily by nerve cells and they affect different parts and systems of the body. Acetylcholine mostly targets the muscles and the brain and it is a part of the parasymphatetic nervous system whereas norepinephrine targets the whole body and has an effect that leads to the contraction of muscles and the increase of the heart rate. Norepinephrine is a part of the symphatetic nervous system.
Since the symphatetic nervous system is responsible for the crucial "fight-or-flight" response of our body, it has a more dramatic effect on the muscle contraction. Norepinephrine, being a part of the symphatetic nervous system, should result in a more drastic change in contractile force.
I hope this answer helps.
According to the top down control, each trophic level is controlled by the very next trophic level. It says that predators control the population of prey.
Therefor the correct answer is D
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