In the northern hemisphere, the Sun reaches the greatest height in the sky at solar noon on which day?
The autumnal equinox
The vernal equinox
The summer equinox
The winter equinox

Which codon is the code for the amino acid histidine (his)?

Indicate the coat color and the proportion of offspring with that color for each of the following crosses of rabbits. assume all are homozygous. agouti x albino a) 1/2 albino, 1/2 agouti b) all agouti c) 3/4 agouti, 1/4 albino

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi