(Question)
Fact 1: Mammals breathe with the help of a diaphragm. Fact 2: Breathing Stomach muscles press against the resistance of the diaphragm. Given the two facts above, answer the question "What is pressed against when mammals breathe?" with the following options: - objects that have mass - the skin - an organism's body - an object - layers of fat - matter vibrating - a cuticle - stomach muscles
(Answer)
stomach muscles

(Question)
Fact 1: Viruses are usually considered to be nonliving. Fact 2: Viruses Viruses are the smallest agents of disease. Given the two facts above, answer the question "What are usually considered to be nonliving?" with the following options: - direct damage to the lungs - bacteria - harmful substances - major threat to health - humans - the smallest agents of disease - starfish - Contaminated wounds
(Answer)
the smallest agents of disease

(Question)
Fact 1: Mutations may change the structure of a chromosome or just change a single nucleotide. Fact 2: DNA is made up of nucleotides. Given the two facts above, answer the question "What can change the structure of DNA?" with the following options: - Mutations - rays or beams - Genes - radiation - DNA - Smoking - Microscope - Chemicals
(Answer)
Mutations