Which of the following chapters in geologic time occurred before there were abundant animals with hard parts?
A. Paleozoic
B. Mesozoic
C. Precambrian
D. Cenozoic
Answer: C
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Natural selection can only occur if a heritable trait can be passed on to offspring at a higher rate than other individuals in a population.
Answer the following statement true (T) or false (F)
What happens to the length of day (the number of hours of daylight) as you move north of the equator?
Figure 9-2: Earth–Sun relations on June solstice.
Noting the orientation of the circle of illumination on June 21, explain the above question.
What will be an ideal response?
Placer deposits are surface accumulations resulting from the mixing of materials as they are transported
Indicate whether the statement is true or false
Which is the most important molecule in the ecosystem?
A) oxygen B) nitrogen C) salt D) lead E) water