Which of the following statements are characteristics of a compound? 1. Compounds are made from two or more elements,
II. A compound is a pure substance.
III. Compounds are represented by a chemical symbol.
IV. Compounds are represented by a chemical formula.

Many kangaroo rats live in the sonoran desert of the southwestern united states. they have a variety of adaptations for living in the desert. under which circumstance would the kangaroo rats of the sonoran desert be most likely to develop new adaptations by natural selection?

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure

This is a membrane-bound, disk-shaped compartment inside chloroplasts and cyanobacteria. they are the site of the light-dependent reactions of photosynthesis.