Which statement best describes why carbon is the key element in organic compounds?
carbon is extremely reactive and must form bonds for stability.
carbon is the most abundant element in the universe.
carbon is the least reactive element on the periodic table.
carbon has a strong tendency to form chains or rings.,

6. in the dna double helix, how are the two strands of dna held together? a. chemical bonds between base pairs hold the two strands of dna together. b. hydrogen bonds between the base pairs hold the two strands of dna together. c. hydrogen bonds between sugar groups and phosphate groups hold the two strands of dna together. d. chemical bonds between sugar groups and phosphate groups hold the two strands of dna together.

Which sequence correctly shows the path of carbon dioxide during repiration?

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions