The model of speciation that requires some time with geographic barriers between two populations, allowing evolution of reproductive isolation, isa) allopatric speciation. b) phyletic gradualism. c) sympatric speciation. d) punctuated equilibrium. e) prezygotic isolation.

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.

How do plants obtain more sunlight a.) they lean towards the light b.)they grow straight up c.) they only live in sunny areas, like the tropics d.) they stay low to the ground

Which to produce involved from a symbiotic relationship of organisms which resulted in eukaryotic organisms contain chloroplast