In what type of climate do trees produce narrower rings?

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

What is the compliment dna strand to the following sequence: ttgactaggcta

2. which is the last step in the scientific method?