There are millions of species of organisms living at this time and new species are still being discovered. Based on Darwin's theory of evolution, which of the following best describes how millions of species have developed?
A. Organisms passed on acquired characteristics to evolve from lower life forms to higher life forms.
B. Organisms were selectively bred to create different species.
C. Completely different species crossed with one another to form the many different organisms.
D. Different genetic variations in organisms were selected in different environments.
Answer: D. Different genetic variations in organisms were selected in different environments.
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Which one of the following correctly lists the major types of tissues found in plants?
A. connective, nervous, muscle, epithelial B. connective, dermal, muscle, nervous C. dermal, ground, vascular D. bone, skin, muscle, nervous, vascular, digestive E. connective, nervous, muscle, dermal
Which of the following is not a likely outcome
of global warming? a. Extinction of species. b. Increased human death due to heat exposure. c. Changes in animal migration patterns. d. Increased waterborne illness. e. All of these are likely outcomes of global warming.
What does this figure suggest is responsible for increasing species diversity?
A) time alone B) increasing leaf litter C) decreasing leaf litter D) increase in agriculture
If the hydrogen bonds between complementary base pairs were disrupted, which level of organization in DNA would be immediately affected?
a) primary b) secondary c) tertiary d) None of the levels would be affected.