Which data can be measured quantitatively? speed of light
odor of gas
texture of a solid
color of a flame

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

What would happen if the krill were removed from the food web

Explain how the political influence of african americans leaders became weaker.