Earth’s atmosphere contains water vapor and carbon dioxide. These greenhouse gases are important because they

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

Iguanas need to live in a habitat that is very warm, so the pet store warms their enclosures with "basking lights" which act as an artificial sun. describe how the three methods of thermal energy transfer may take place within the iguana's enclosure.

Nucleic acids offer variability because they contain alternate forms of genes called .