Which of the above mammals are The most closely related to each other

Manatee and sea lion

Dolphin and manatee

Dolphin and whale

Manatee and whale

The study of interaction between living organisms and their enviroment is called (a) phytogeography (b) ecology (c) phytosociology (d) ecosystem

What is the best-known carbohydrate?

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection