Why must the heart contract very strongly to pump blood from the left ventricle into the aorta?

The  central dogma  of molecular biology is centered upon the process of protein synthesis, in which the information from dna is transcribed and translated, resulting in multiple amino acids being joined to form a)lipidsb)proteinsc)carbohydratesd)nucleic acids

How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous