The best answer is D.
In active transport, molecules move against a concentration gradient from areas of lower concentration to areas of higher concentration. This happens a lot in neurons. The membrane proteins are constantly pumping ions in and out to get the membrane of the neuron ready to transmit electrical impulses.
In active transport , energy is required to move molecules across the cell membrane. Carrier proteins are needed for this e.g. proteins of the GLUT family which transport glucose molecules across the cell membrane. Carrier proteins are very specific. GLUT proteins will only move glucose molecules and not sodium or calcium. There are hundreds of types of carrier proteins.
From my research,the answer is there is no most important parts that form in a fetus. While a child is in their mothers womb every moment that fetus is growing and forming into a soon to be born baby is important .
Answer:
Panther Has no spots on its long body or tail. But it ha shiny coat of dark fur, they have small heads , really strong jaws and mostly green eyes.
Explanation:
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