Which is the dominant structure during the life cycle of a fern?
1.gametophyte
2.sporophyte
3.archegonium
4.sporangium
2
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The two main factors controlling the density of water are:
a. salinity and temperature. b. salinity and heat capacity. c. salinity and pH. d. pH and heat capacity. e. temperature and pH.
At high tide a coastal plant or animal cell will be in
Estuaries are locations where rivers flow into oceans, with tidal shifts changing the salt concentrations. Plants and animals that live in estuaries face a dilemma in maintaining water balance inside their cells. During high tide they are in salt water, while at low tide they are in fresh water. A. osmosis. B. an isotonic solution. C. a hypotonic solution. D. a hypertonic solution. E. equilibrium.
Although actinomycetes vary in many ways, they all share a common type of cell wall.
Answer the following statement true (T) or false (F)
Two populations of catfish have lived in separate neighboring lakes for many generations. Population A contains about 30% short whiskered catfish (ww) and 70% long whiskered catfish (WW or Ww); Population B contains about 10% short whiskered catfish and 90% long whiskered catfish. Following a year of record rainfall, both lakes rise enough to allow the catfish populations to swim between the two lakes and interbreed. What will be the effect(s) over time of this interbreeding?
A. Population A will see an increase in long whiskered fish and Population B will see an increase in short whiskered fish. B. Population A and Population B will experience an increase in genetic diversity. C. Population A will see an increase in long whiskered fish, but Population B will not see any changes in the prevalence of the two phenotypes. D. DIfferences in the frequencies of W and w between the two populations will decrease. E. DIfferences in the frequencies of W and w between the two populations will increase. F. Population B will see an increase in short whiskered fish, but Population A will not see any changes in the prevalence of the two phenotypes.