Which of the following is a process used by animals that produces carbon dioxide as a by-product? Combustion
Diffusion
Photosynthesis
Respiration

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes