An ecosystem includes all the living organisms in an area as well as the organisms' physical environment. an ecosystem is occupied by various populations, or groups of organisms of the same species.

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

Hershey and chase confirmed that dna, not protein, was the genetic material. how do the results of their two experiments support this conclusion?