What is a scientist called who observes animals in order to explain their behavior?
ecologist
ethologist
environmentalist
psychologist

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

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

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure