Leeches are clasified as:

One purpose of a ATP molecules in plant and animal cells?

Which of the following describes an aspect of fetal circulation that does not occur in adult circulation? Both oxygenated and deoxygenated blood use the umbilical artery. Both oxygenated and deoxygenated blood use the umbilical vein.

Hydrocarbons are created from the compressed remains of living organisms. True False

Scientists originally thought cell membranes evolved before RNA. However, recent evidence suggests RNA developed before the membranes that envelop it. Explain why this is logical in light of the composition and function of both RNA and membranes.

How to calculate the number of cells per ml of original culture?

What part of the volcano does lava come out of?

What do plants take in during photosynthesis

Complete obstruction of bile flow to the liver would be manifested by:

Besides filtering blood for foreign materials and phagocytosis of old, defective erythrocytes, the spleen is also involved in what other major function?

What would most likely happen to a person who is not getting enough essential amino acids in his or her diet?