In most terrestrial and many aquatic ecosystems, the food chain is the dominant pathway of energy flow

According to the theory of punctuated equilibrium, at what rate does speciation occur? species change depending on the rate of natural selection. after periods of stasis, new species evolve relatively rapidly. species change slowly and eventually form new species. some species change quickly and others change slowly to balance the overall rate.

Robert wants to know which fertilizer will work the best for his grass. what can he do to explore this inquiry?

Which symbols below represent the ions found in the glass of water ? a. oh- and h+ b. co2 and o2 c. o2 and h2 d. nh3- and h+