Answer:
It is a hypothesis that explains the origin of evolutionary reversions.
Explanation:
A phylogenetic tree may indicate that genes required for forming anatomical structures such as wings are not completely lost and they are activated many times during the evolution.
Each spinal nerve consists of a dorsal and ventral root
The ventral root sends impulses from the central nervous system to its corresponding parts of the body. It is also called the anterior root or motor.
The symptoms will be:
- Loss of movement of the extremities
- radiating back pain up to the glutes, and leg pain
- Tremor and fatigue
Answer:
d. on the plasma membrane
Explanation:
According to the endosymbiotic theory the origin of mitochondrion is from the prokaryotic organism: primitive host cell (future eukaryotic cell) engulfed prokaryotic cell (endosymbiont) that provided the functions that evolved into mitochondria. Both of them had benefits: the endosymbiont gained protection and some essential nutrients from the host, while host had the energy and oxygen source from the endosymbiont.
So, the plasma membrane of the endosymbiotic prokaryotic cell became the membrane of the mitochondrion.
