The first dinosaurs appeared during the ________ period
Fill in the blank(s) with correct word
Triassic
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In the book entitled,On the Origin of Species by Means of Natural Selection, ____ proposed that natural mechanisms
produce and transform the diversity of life on Earth.
a. Alfred Russel Wallace b. Charles Lyell c. Charles Darwin d. Joseph Hooker e. Charles Darwin and Alfred Russel Wallace
Oxygenated blood can be found in the following chambers of the heart: ________ and ________
Fill in the blank(s) with correct word
If a cell contains lysosomes, what type of cell must it be?
a. a fungal cell b. a prokaryotic cell c. an animal cell d. a plant cell
Application of fertilizers to aquatic ecosystems stimulates primary production just as it does in agricultural ecosystems. In aquatic ecosystems, the enhanced production can eventually lead to:
A) accumulation of toxic heavy metals. B) anoxic conditions. C) conditions more attractive to recreational activities. D) increase in food web complexity.