How do energy changes effect wether a chemical reaction will occur?

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box

Organisms may contain up to five levels of organization within their bodies. which level of organization is shown by the liver? a. tissue b. organ c. organism d. organ system

Ineed a little . why do you think there is a basic difference between the kinds of fertilization most common in aquatic and terrestrial animals?