Harmful introduced species usually come into an area by:
a. human beings.
b. the species themselves.
c. hurricanes.
d. floods.
e. parasites.
a
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What kind of climate is most often associated with epiphytic plants?
A) warm B) humid C) sunny D) freezing
Answer the question using the accompanying figure. Humans living in environments with access to good medical care
are most likely to exhibit which of the following survivorship curves?
a. Type I, which is graph A b. Type II, which is graph B c. Type I, which is graph C d. Type III, which is graph C e. Type III, which is graph A
How might absorption of organic compounds into clays assist in their aggregation and organization
into membrane-bound protocells?
a. Clays contain many minerals in extremely thin layers and readily repel ions, forcing multiple chemical interactions. b. Clays are highly structured, contain water, and store potential energy that could drive the chemical reactions forward. c. Clays lack water, forcing the concentration of the organic molecules and thus driving multiple interactions. d. Clays are extremely resistant to temperature changes and thus would insulate the organic compounds from temperature changes in the atmosphere. e. None of the above statements accurately explain clays’ possible roles in the formation of protocells.
The constant region of an antibody
A) has no function. B) recognizes and binds to the antigen. C) stimulates the production of macrophages and T-cells. D) determines where the antibody is located and its role in the immune response.