The greenhouse effect is increased the most by
burning coal
nuclear reactions
refining oil
mining coal

The skeletal system performs a variety of functions that are crucial to maintaining life processes. what function is performed in the bone marrow, but not in the ossified bones of the skeleton? a oxygen transportation c mineral storage b. muscle attachment d red blood cell production

Select the correct answer. which term do biologists use to describe the average number of individuals of a species per unit area? a. carrying capacity b. population density c. minimal viable population d. survivability curve

Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16