Answer:
Arteries carry oxygenated blood away from the heart. Veins carry the blood back to the heart. Veins contain valves that ensure blood flows in only one direction. Arteries don’t require valves because pressure from the heart is so strong that blood is only able to flow in one direction.
Explanation:
Hostility is the emotion particularly related to Coronary Heart Disease. Hostility by definition is having stable attitude of harboring ill-feelings and negative perception towards others and even on events. According to some literature, purely speculative in nature since the researchers weren't able to measure them,such predictive effect of hostility towards CHD is brought about by elevation of stress hormones and other factors.
Answer:
B - radioactive nucleotide
Explanation:
i got it correct
scientists can test differences of the area with pigmentation by observing which is lighter and which is darker however they use microscope to look the difference of the pigmentation over the cells.
A. 1000 grams. 1000 is divided by ten each time it goes up the trophic scale. since it goes up 2, 3 and 4, the answer is 1000. (1000/10/10/10=1)
