How were conditions on the early Earth of more than three billion years ago different from those on today's Earth? Unlike Earth today, early Earth _____
A) had an atmosphere rich in gases released from volcanic eruptions
B) had an oxidizing atmosphere
C) experienced little high energy radiation from the sun
D) had an atmosphere with significant quantities of ozone
A
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An individual is unable to detect any chemicals. Which of the following would retain function?
1.free nerve endings 2.hair cells 3.taste receptors 4.olfactory receptors
The relationship between DNA and RNA is ____
a. antagonistic
b. opposite c. exact duplicate d. complementary e. unrelated
Which animal is classified as a primary consumer?
a. horse b. bear c. human d. fish e. dog
All of the ____ are a community.
A. sugar maple trees on Earth B. living organisms in a forest C. squirrels in a forest D. living and nonliving things in the forest