A researcher is conducting an experiment where he tests a new drug to see its effect on neurons. As he monitors the brains of his test animals, he notices that their neurons have started to grow extra processes on the end of each axon. These extra cell growths are examples of

Terminal buttons.

Explanation:

Neurons are longest animal cell that serve as the basic unit of their nervous system.

The neuron is divided into two parts-

Cyton: It is the cell body of the neuron. It has projection extending from the cytoplasm that receive signals called dendrites.

Axon: It is a long process extending from the cyton that carries the impulse from cell body to end of neuron. The axon terminate at knob like structures called terminal button . These release neurotransmitter and are rich in mitochondria.

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

due to the fact that it skipped a generation we can tell it is definitely not a dominant trait, therefore it must be recessive. i think this is right let me know!

explanation: