Plant cells undergo photosynthesis to produce glucose, a usable form of chemical energy. the energy produced by plants becomes the base of an energy pyramid. given the situation seen above, what reactant is missing in order for photosynthesis to occur?

it would be c. xylem.

im not in connections yet but i might can you some questions. what grade are you in?

ans.

in united states (us), the first leading cause of death for both women and men is heart diseases that leads to more than half of the deaths. heart diseases develop due to narrow arteries, buildup of plaque in blood capillaries that arises difficulties in blood flow.

the second leading cause of deaths in us is cancer that affects individuals of all ages. it develops due to uncontrolled growth and spread of tumor cells, which results in death if the not controlled or treated.

the third leading cause of deaths in us is copd or chronic obstructive pulmonary disease. it includes difficulty in breathing, chest infections, and persistent cough. smocking is a leading cause of copd and around 80% of copd deaths occur due to smoking.

thus, the correct answer is 'option). cancer, copd, and heart disease.'