Agroup of mice becomes separated by the formation of a river. over time, the northern mice became smaller and whiter, while the southern mice became larger and browner. this is an example of: a. acquired characteristics b. speciation by isolation c. gigantification d. homologous structures

The answer is b. Speciation by Isolation

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.

The answer is letter c