(Q).
If skin helps keep out harmful substances, then what does skin help keep out? Answer choices: - medicine - sun's heat - heat - hurtful words - a pathogens - parasites - harmful substances - Echinoderm.
(A).
harmful substances

(Q).
If when something freezes, the density changes, then what property of a substance changes when it is frozen? Answer choices: - motility - molecular make-up - molecules - elements contained - Weight - energy - size - density
(A).
density

(Q).
If most producers grow roots down into the soil to absorb water and minerals, then what can a producer grow down into the soil in order to absorb minerals and water? Answer choices: - Trees - stems - roots - Oak - seeds - burrs - grass - water absorbing petals
(A).
roots