A rise in aquatic nitrogen and phosphorus levels leads to a strong increase in the population growth rate of algae and cyanobacteria. This suggests that nitrogen and phosphorus are typically _______________ in aquatic habitats
A. always abundant
B. not at all present
C. the limiting factors for planktonic growth
D. unnecessary for planktonic growth
C
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Both malaria and yellow fever are transmitted by mosquitoes
Indicate whether this statement is TRUE or FALSE.
Typical conditions used for sterilization are
A. 100?C for 10 minutes. B. 121?C at 15 psi for 15 minutes. C. 80?C for 15 minutes. D. 72?C for 15 seconds.
Which is the only group of eukaryotes that has two types of nuclei in each cell: one or more small micronuclei, and a single larger macronucleus?
1.Sporozoans 2.Dinoflagellates 3.Euglenoids 4.Ciliates
The major function of the protonephridia in the flatworm is to:
a. conserve water. b. conserve salts. c. eliminate waste materials such as ammonia and urea. d. eliminate excess water. e. regulate the pH of the gastrovascular cavity.