External Fertilization

Metamorphosis

Amniotic Eggs

Scales

Gills in adult

Spinal cord

Lungs in adults

Ectothemic

The central nervous system is perhaps one of the most important systems in our bodies. It consists of the brain and spinal cord and is responsible for controlling most of the body and mind’s functions. However, when the spinal cord, or the means of transport for these electrical nerve impulses to travel between the body and the brain, becomes hindered, interesting side effects can occur.

The spine in the human body consists of 26 bones in your back, which allows you to stand straight and bend over. But, another important job of the spine is to protect the spinal cord from being hurt. About 75 percent of cases of spinal stenos occur in the lower back, which causes a narrowing of the spine that compresses the nerve root causing pain in the back of the leg. Nevertheless, this is only one of many possible signs and symptoms that you might be suffering from spinal stenosis.

Explanation:

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this