What is the difference between active transport and diffusion in terms of movement of particles?

Which of the following claims does the author support the least

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

Why do you think the puppy litter was all dark-haired?