What gas do animals exhale?
Your
Oxygen
Carbon Dioxide
Nitrogen

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer