(Q).
If thirst is used to make an animal realize that it needs to replenish H2O in its body, then thirst shows an animal that it needs what? Answer choices: - CO2 - H2O - He - food - feed - urea - O2 - H20
(A).
H2O

(Q).
If most mammals have a body covering for keeping warm, then most mammals have a body what for keeping warm? Answer choices: - four limbs - exoskeleton - warm - scales - sweating - covering - bareness - opening
(A).
covering

(Q).
If animals use pheromones to reproduce, then what are pheromones used for? Answer choices: - genetic diversity - Predators - gene flow - growth - Plant reproduction - Reproduction - Protection - Digestion
(A).
Reproduction