Annelids must utilize ____ muscles in order to move
a. only circular
b. only longitudinal
c. crosswise
d. circular and longitudinal
e. crosswise or longitudinal
ANSWER: d
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Answer the following statements true (T) or false (F)
1. The use of fossil fuels has increased the available resources for populations around the world, contributing to the exponential growth rate of the human population. 2. Developing countries are less likely to agree on a global climate change treaty because they might fear that it will slow their economic growth. 3. Population sizes of predators and their prey in a community are constant over time. 4. Pioneer species make up the climax community of a given ecosystem. 5. The main source of water in streams is replenished from groundwater.
A reaction of a strong acid and a strong base will produce water and
a. a buffer. b. a salt. c. gas. d. solid precipitate. e. solute.
Which alternate hypothesis might also explain industrial melanism?
A. Pollution kills important tree species that peppered moths depend on for egg laying. B. Dark moths emigrate out of polluted areas to escape the pollution. C. Dark moths are more resistant to the toxic effects of pollution than light moths. D. Birds used the marks that Kettlewell placed on the moths when he released them to help them find and capture the moths. E. Because dark moths absorb more heat, they are more active and better able to avoid bird predation.
If you have two alleles for the gene Z and the allele frequency of Z is 80% then the allele frequency of z must be ______________.
a. 0% b. 20% c. 80% d. 100%