Atype of mutation that can alter dna by the loss of a nucleotide base is known as

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 sunflower because each experiment got the same results

hope this !

-payshence