Many insects, fish, and mammals release certain chemical messengers to signal reproductive readiness. what are these messengers called? select one of the options below as your a. hormones b. pheromones c. enzymes

Facilitates growth and change in neurons and the migration of neurons to different sites in the brain

Aflame cell is at the end of each tubule of the nephridium malpighian tubules kidneys none of the above

Consider the classification levels of a human. eukarya ,animalia ,chordata ,mammalia ,primates, hominidae ,homo ,sapiens .which is the most specific taxonomic level in the classification system above? a sapiens b homo c hominidae d primates