Which of the following are required for photosynthesis to take place? [mark all correct answers
a. Water
b. Oxygen
e. Carbon Dioxide
d. Sugar
e. Sunlight
f. Soil

Microorganisms are involved in each of the following processes excepta. smog production.b. food production.c. infection.d. o2 production.e. decomposition of organic material.

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?