All plants and animals in a food chain use energy. where does this energy start from?

a. the sun
b. consumers
c. predators

Use this diagram of an animal cell to answer the question. where does the first stage of cellular respiration occur? w x y z

Heat from earths interior and pressure from overlying rock transform the remains of marine sediments into

If the coding part of an mrna molecule is 1800 nucleotides (bases) in length, this molecule will contain codons and code for a polypeptide that is amino acids long.