Which of the following could describe species diversity?
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variety of genes within a population
variety of different types of landmasses in an
area
variety of different organisms in an area
variety of habitats within an ecosystem

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Your town is considering building a biodiesel power plant describe at least two advantages and two disadvantages