The coronary sinus is a collection of veins that drain___ type of blood into the .

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content