It is impossible for humans to be at the bottom of the food chain

Apopulation of bears has genetic diversity. some of the bears have an allele that gives them thicker fur. due to climate change, the winters have gotten colder in their habitat. now the bears with thicker fur are becoming more common in the population. a.) which type of bear is selected for in the coldest ecosystem? b.) what must be the other allele for the type of fur, and what term would you use to describe the fact that the allele is becoming less common in the colder climate? c.) describe the change in the bear population in terms of changing allele frequencies and phenotypes d.) is this an example of natural selection

How fast is a cheetah compared to a hyena?

Soils, fertilizers, and pesticides erode and are transported by surrounding waterways to a different location. which of the following is where they will most likely end up? a) they will be found on a faraway beach. b) they will be carried by a river and then deposited in the delta area. c) they will be found in mountainous regions. d) they will become airborne and travel with the wind around the earth.