In this lab, the three flocks of birds changed in numbers between generation 1 and generation 3. Why? Check all reasons. The amount of food available increased and decreased.

If a flock’s beak type made it easier to pick up the available food, the flock grew.

If a flock’s beak type made it harder to pick up the available food, the flock shrunk.

If a flock's beak type made it harder to pick up the available food and If a flock's beak type made it easier to pick up the available food

Explanation: Hope this helps :)

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.

the backbone of the dna and rna compound is sugar phosphate.