What do the three nucleotide bases on an mRNA molecule (called a codon) provide a code for? six amino acids
two amino acids
three amino acids
one amino acid

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

Need the diagram below, which is not drawn to scale, shows the position of the earth, moon, and sun. what type of eclipse occurs when the earth, moon, and sun are lined up in the order shown? a. planetary eclipse b. solar eclipse c. martian eclipse d. lunar eclipse

Which statement describes the punctuated equilibrium theory?