According to theory, what best describes the universe before big bang a. a star b. a planet c. a cloud of dust and gas d. a densely packed space

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth

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.

What will happen if deforestation continue to destroy the green plant on the planet