Answer:
Joint - a joint is where two bones articulate
In this case, the femur and tibia form a joint.
Period of what? ................
<span>The primary excitatory neurotransmitter in the brain and spinal cord is Glutamate. Glutamate is an amino acid that is responsible for binding receptors in the central nervous system and is found at almost all synapses. It helps transmit signals across the synapses.</span>
Answer:
A separation of a species or population so that they no longer interbreed and evolve into two separate species.They must mate with other species; the gene pools of two populations must become separated, or reproductively isolated.
Explanation: