With __________, an animal modifies a voluntary behavior in response to the behavior's
consequences. Fill in the blank(s) with the appropriate word(s).
operant conditioning
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How does phosphorus normally enter ecosystems?
A) cellular respiration B) photosynthesis C) rock weathering D) vulcanism E) atmospheric phosphorous gas
Match the following items with the correct phrases.
_______1. Several dozen people having nausea and diarrhea several hours after a church picnic. _______2. A disease that occurs only every once in a while in a particular geographic region. _______3. A disease that is always present in a particular geographical region. a. endemic disease b. epidemic disease c. pandemic disease d. sporadic disease
The relationship between a gene and a messenger RNA is that ________
A) mRNAs are made from genes B) genes are structurally identical to mRNAs C) mRNAs make proteins, which then code for genes D) mRNA is directly responsible for making Okazaki fragments E) genes are made from mRNAs
Please explain why a population may never reach its most fit phenotype
What will be an ideal response?