Why does water sink in polar regions?

a. evaporation due to strong wind creates gyres.
b. water gets colder and saltier there, increasing its density.
c. southern oscillation currents force water down as they strike land.
d. the great ocean conveyor belt transports water around the globe over many
years' time.

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

In pea plants, yellow seed color (y) is dominant and green seed color (y) is recessive. based on the punnett squares, what are the chances that the offspring in the second generation will have green seeds? first generation y y y yy yy y yy yy second generation y y y yy yy y yy yy there is a % chance that the offspring will have green seeds.

Approximately what wavelength of light is best absorbed by chlorophyll a