Answer:
(B) They Bind to receptor proteins on the surface of the postsynaptic neuron.
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Complex organisms need cells that can perform many different functions. they need to be supported on a cellular level. Without specialized cells you they won't be able to perform different functions.
Answer:
relate it to your eyeball
Because carry out all the functions in the human body necessary for living. Proteins make up hormones that are required for living. Insulin - responsible for stabilising blood sugar. Haemoglobin - responsible for carrying oxygen around the body. Melatonin - responsible for helping us get to sleep. Adrenalin - responsible for the flight-fight-freeze response. There are many more but here are just a few.
The answer is that are small
Biologists consider genetic drift as a random change in a gene variant due to random sampling organism
