Protozoa, other than Euglena, are called animal-like protists because they . A. cannot produce their own food.
B. can produce their own food
C. have cell walls
D. do not have cell membranes
2.Tina observed a cell under a microscope. She concluded that it was a plant cell instead of an animal cell. Which structure helped her come to this conclusion?
A. She saw a chloroplast, which animal cells lack.
B. She saw a vacuole, which animal cells lack.
C. She saw a nucleus, which animal cells lack.
D. She saw a cell membrane, which animal cells lack.

bc blah

explanation:

bc blah

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.