Robert koch was a prominent player in all of the following but
a. solid media
b. anthrax
c. vaccines
d. all of the above

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

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion