One reason that bacteria can be harmful is that they: a. can remove nitrogen gas from the air. b. have cell walls with peptidoglycan. c. can produce toxins that kill other cells. d. live in the digestive tracts of animals.

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.

The hematodinium parasite becomes less of a problem for the blue crab when the crab is very young. fishing is thriving in the region. the crab moves to less salty water. a significant percentage of the population is impacted.

What was darwins theory of common decent