Which of the following statements about landfills is false?
A. Degradation of wastes is rapid and inexpensive.
B. The excavated site has a plastic liner to prevent wastes from leaching into groundwater.
C. Recycling greatly reduces the amount of wastes sent to landfills.
D. Dangerous levels of methane gas can accumulate.
A
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When communities of organisms interact with their physical environment they form a(n)
A. population. B. organism. C. community. D. ecosystem. E. macromolecular community.
The cell membrane can be described most accurately as
A) permeable to most small molecules but impermeable to larger ones. B) permeable to only larger molecules. C) permeable to all molecules. D) permeable to some molecules and impermeable to others. E) impermeable to all polar molecules.
Which of the following is likely to be true, based on the following cladogram?
1.Amphibians and lungfishes are sister groups.
2.Amphibians and amniotes both have four limbs and a swim bladder or lungs.
3.Amphibians and lungfishes both have four limbs and a swim bladder or lungs.
4.All of the groups listed have a backbone and a skull.
What is the only source of all new alleles?
a. mutation b. gene flow c. genetic drift d. natural selection e. genetic polymorphism