________ defines the size of a population, the number of individuals in it
Fill in the blank(s) with correct word
Abundance
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Which of the following is the main reason why pollen withstands decay much better than typical plant parts?
a. hemicellulose b. sporopollenin c. lignin d. cellulose e. pectin
Photosynthesis occurs in chloroplasts of prokaryotes.
Answer the following statement true (T) or false (F)
Some have claimed that the herb echinacea reduces the likelihood of catching the common cold. In many hundreds of studies, this claim has been refuted. Assuming these studies were properly conducted, which of the following is a scientifically responsible claim that an echinacea advocate could make in support of further research on this subject?
a) the effective drug dosage of echinacea was outside the range of the dosages given in the scientific studies b) the investigators were paid off by the drug companies c) the effective length of time needed for taking echinacea is longer than that provided in any of the scientific studies d) all of the answer choices are correct e) only the first and third answers choices are correct
In cases of __________ growth, a population's growth rate remains constant and greater than zero.
Fill in the blank(s) with the appropriate word(s).