The total number of observed links in the food web divided by the total number of species is the
A) connectance.
B) Simpson index.
C) linkage density.
D) mean chain length.
C
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Which structure is the major transport system for sperm?
a. testes b. epididymis c. vas deferens d. seminal vesicle e. prostate gland
As the structural diversity of plant communities increases, the species richness of animals also increases
Indicate whether the statement is true or false
A covalent bond is likely to be polar if ________.
a. the 2 atoms sharing electrons are equally electronegative b. one of the atoms sharing electrons is much more electronegative c. it is between atoms that are both very strong electron acceptors d. The 2 atoms sharing electrons are of the same element.
Absolute dating uses _____________ to estimate how old a fossil is
A. Structural features B. Embryonic structures C. Depth within rock layers D. A molecular clock E. Radioactive isotopes