Ocean exploration is limited by
a. lack of technology
b. expense
c. favorable weather conditions
d. all of the above

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

9. wind power creates pollution. water air soil noise

Match each symbol with its description.