According to stratigraphy and its laws, what is the correct order—from oldest to youngest—of the following rock strata:

B, C, D, A
D, C, B, A
B, C, A, D
A, B, C, D

Groups of organisms with low biotic potential, such as gray whales, that produce at most one offspring every other year a) are r-selected b) are k-selected c) are not subject to density-dependent limiting factors d) show the initial stages of the extinction process e) have escaped from the processes of natural selection and adaptation

Imagine you are introducing the lac operan and the trp operon to students who have never learned about it before. complete the table to compare the similarities and differences between the two operons

What do your cells need to live? a. carbon dioxide b. carbon c. air d. oxygen