What macromolecules are a and b? answer choices:
1) lipid
2) carbohydrate
3) protein

the correct answer is phenotype

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this