The most prominent features of a narrow v-shaped valley where the stream profile drops quickly are
a. meanders and floodplains.
b. rapids and waterfalls.
c. lakes and ponds.
d. deltas and natural levees.

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.

In 2001, records showed that local stocks of fish were down worldwide. yet, records of harvests indicated that fish were being taken at records rates. what was actually happening?

Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups