How does brood parasitism harm the hosts and benefit the parasite?
What will be an ideal response?
The host species suffers by squandering care on unrelated individuals and therefore it decreases their reproductive rate as more energy is spent on paternal care. The parasitic bird species benefits by not having to invest in parental care. This allows more energy to be spent on reproduction. The females can produce a large number of eggs.
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Some regions of chromosomes remain highly condensed, tightly coiled, and untranscribed throughout the cell cycle. These regions are referred to as
A. transposable elements. B. single sequence repeats. C. non-coding DNA. D. short interspersed elements. E. constitutive heterchromatin.
A hydrostatic skeleton consists of _____
a. a fluid in an enclosed space b. hardened plates at the surface of a body c. internal hard parts d. none of these
Bone marrow is a site where mature immune cells are found.
a. true b. false
During ventricular systole, the semilunar valves ________ and the AV valves ________
A) open; open B) close; open C) open; close D) close; close