PLEASE ANSWER ALL QUESTIONS Percentage of oxygen in inhaled air and exhaled air experiment.
Aim:

Hypothesis:

Variables:
a. Manipulated
b. Responding
c. Constant

Apparatus/Material:

Figure:

Procedures/Methods:

Observations:

Interprete Data:

Discussion:

Conclusion:​

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Which of the following is the best definition for the process of photosynthesis? a.) plants digest sugars to make energy. b.) plants use oxygen and glucose to make carbon dioxide. c.) plants use sunlight and carbon dioxide to make sugars. d.) plants use sunlight to make chlorophyll and chloroplasts.