What is the main difference between a cell nucleus and a nucleoid?
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a. presence or absence of a surrounding membrane
b. arrangement of the cytoskeleton
c. back and forth movement of a flagella
d. size of the organelle

Which events are likely to be catastrophic to an ecosystem? select the three correct answers. a-hurricane. b-steady population growth. c-seasonal flooding. d-introducing of an aggressive invasive species. e-tsunami.

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

Animals such as pronghorn antelope, bison ans badgers dot to the landscape. where are these animals located?