If springs can be fed from precipitation that soaks into the ground, then springs can be fed by what? Answer choices: - mechanical waves - vernal equinox - precipitation - rainfall - digestive track - water vapor - aqueous solution - carnivores
precipitation

If irradiated food improves food safety, then what does irradiating food do? Answer choices: - Relieve pain - enhance food's nutrients - improves food safety - allows growth of bacteria - increases food waste - chemical changes - get chemical reactions started - major threat to health
improves food safety

If antigens are a group of atoms that the immune system recognizes as foreign to the body, then what type of antigens does the immune system recognize as foreign to the body? Answer choices: - animals - epidermal - Allergies - negative - dangerous - graptolites - group of atoms - homogenous
group of atoms