Match these up
1. human sewage
2. limiting nutrient
3. dead organisms and solid waste
4. human activity
5. 80% of air

a. can cause eutrophication
b. nitrogen gas
c. account(s) for even more production of nitrogen than nature does
d. amount available can determine how fast growth happens.
e. contain(s) nitrogen compounds that are converted by bacteria to ammonia

Which of the following statements about c4 carbon fixation is not true? a c4 carbon fixation is an adaptation for plants exposed to high light intensityb. c4 carbon fixation occurs in more plants than c3 carbon fixation.c c4 carbon fixation is more common in areas of high temperatures than c3 carbon fixation.d. c4 carbon fixation occurs in the inner cells of a leaf rather than the entire leaf.

Out of the seven main animal groups (fish, mammals, birds, insects, reptiles, amphibians, and arachnids), how many contain members with internal backbones? a. 5 b. 3 c. 7 d. 1

Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.