HELP PLZ! Which energy source has no greenhouse gas emissions but has waste products that present a health hazard for humans?

Group of answer choices

petroleum

nuclear

coal

geothermal

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

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

Which of the follow describes a disadvantage secondary sources have compared to primary sources?