What is trophic cascade as mentioned in this video titled "how wolves change rivers? "

a• how the rivers flow throughout yellowstone national park.

b• ecological process that starts at top of the food chain and tumbles down to the bottom of the food chain.

c•different types of food chains and food webs.

d• ecological process that starts at the bottom of the food chain and works it way up to the top of the food chain

Ascientist and her team counted 200 individual deer in an area of 10 square kilometers. what is the population density?

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

Recent research by marine biologists suggests that bottlenose dolphins have names for themselves. scientists played sounds they had identified as the names of particular dolphins, putting them through a synthesizer so that they did not sound like the voices of particular dolphins. the researchers found that dolphins would respond to the names of other dolphins that they were related to or associated with, but they ignored the names of strangers. this discovery suggests a much greater degree of self-awareness in aquatic mammals than was previously suspected. if this research holds up, what does it suggest about dolphins?