Weathering – Decide whether the statement is an example of chemical or mechanical weathering. Write “M” for mechanical or “C” for chemical in the space provided. 1. Mosses growing on the surface of rocks, producing pits in the rock.
2. The wedging of tree roots along natural joints in granite outcrops.
4. The oxidation of minerals that contain iron.
5. Animal burrows in soil that let in water and air.
6. Repeated freezing and thawing of water that cracks rock.
7. The action of water, salt, and air on car fenders and panels.
8. Acids from plant roots which break up rock.
9. Formation of potholes in streets during severe winters.
10. Lifted sections of sidewalk along tree-lined streets.
11. A small rock falling from a cliff.
12. Feldspar mixing with acidic groundwater and producing clay minerals.
13. Halite in rocks dissolving in water.

Lactic acid and energy are produced in muscle cells during choose 1 aerobic respiration cellular respiration anaerobic respiration cellular division

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.

Which of these is not a nucleotide base found in dna?