3. Photosynthesis observes the law of conservation of mass and energy because a. it contains both matter and energy
b. photosynthesis helps conserve nature
c. people try to conserve both plants and animals.
d. it has the same amount of matter and energy at the beginning and the end of the reactions.

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

Cpr, or cardiopulmonary resuscitation, is a first-aid technique to save lives. it involves compressions of the patient's chest cavity. which description is the best description of the functions of chest compressions in cpr? chest compressions are done to pump the heart. chest compressions are done to strengthen the rib bones. chest compressions increase carbon dioxide inhalation. chest compressions allow the patient's muscles to wake up.

Need with these questions . need the answers in a rush for these questions are the answers i put down are correct or not? ?