human activity can release nitrogen into the environment by 2 means
What will be an ideal response?
1. combustion of fossil fuels
2.Artifical fertilizers
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Four of the following are true of euglenoids. Which statement is false?
a. Many move by pseudopods. b. Many contain chloroplasts. c. Many absorb nutrients from their environment in a heterotrophic manner. d. Their cell body is surrounded by a pellicle. e. They use a contractile vacuole to maintain water balance.
Nearsightedness is caused by a(n) _____
a. eye structure that focuses an image in front of the retina b. eye structure that focuses an image behind the retina c. eyeball that is too short d. recessive trait on the Y chromosome e. recessive trait on the X chromosome
In aquatic ecosystems, primary productivity is most dependent on
A) species richness and diversity B) the type of soil C) the rate of photosynthesis D) organic nutrients E) inorganic nutrients
Choose the most appropriate answer for each.
A. Camouflage B. Species evenness C. Parasitism D. Pioneer species E. Primary succession F. Species richness G. Mutualism H. Competitive exclusion I. Mimicry J. Succession K. Secondary succession