What were the first living organisms called on earth

Which two structures of plants and fungi perform similar functions? A. leaves and fruiting body B. stem and hyphae C. root and mycelium D. stem and fruiting body

Receptor editing of immature lymphocytes occurs in generative lymphoid organs true

Each year, smoking causes more than 250,000 deaths from cardiovascular disease-far more than it causes from cancer and lung disease. a. True b. False

I'm not sure how to classify this question so I'll just put it under Biology Why would a biologist be interested in sedimentary rocks?

How nucleic acids and proteins work together to provide instructions for the structures and functions of an organism

Viruses cannot reproduce on their own and require a host organism to do it for them. This is one reason viruses are not considered to be alive

If the environment changes what is the first thing a species will do to survive

Rheumatoid arthritis is an autoimmune disease which causes the joints in the body to be constantly inflammed. This disease results when body tissues are A. attacked by one's own immune system. B. infected by a virus. C. infected by bacteria. D.

If you push a chair across the floor at a constant velocity, how does the force compare with the force you exert

A hiker climbs a hill. How does the potential energy of the hiker change as she climbs higher?