How does current affect biodiversity in rivers and streams?
a. it prevents bacteria and algae from living in rivers and streams.
b. it causes a decrease in biodiversity by preventing organisms from remaining in rivers and streams.
c. it mixes the nutrients for plant and animal use and determines location of organisms.
d. it has no affect on biodiversity.

Neelaredoxin is a 15-kda protein that is a gene product common in anaerobic prokaryotes. it has superoxide-scavenging activity, and it is constitutively expressed. in addition, its expression is not further induced during its exposure to o2 or h2o2 (silva, g., et al. 2001. j. bacteriol. 183: 4413–4420). which of the following statements best describes neelaredoxin synthesis? a-neelaredoxin is produced at all times; levels are constant even when exposed to o2 or h2o2.b-neelaredoxin is produced at all times; exposure to o2 or h2o2 increases expression.c-neelaredoxin is produced at all times; exposure to o2 or h2o2 decreases or prevents expression.d-neelaredoxin is only produced when there is exposure to o2 or h2o2.

What is the difference between a scientific hypotheses and a scientific theory?

Ihave a question. diplontic animals usually produce both eggs or sperm which are :