(Q).
If preservatives are added to food to prolong it's shelf life, then what prolongs the storage life of food in space? Answer choices: - hydrogen and oxygen - preservatives - Dehydration - heating liquids - Fuel cells - heat energy - hard outer covering - layers of fat
(A).
preservatives

(Q).
If plasma cells kill bacteria, then what kills bacteria? Answer choices: - rays or beams - Plasma cells - Cooking - an electric stove - Petri dish - deal - phlange - evaporation
(A).
Plasma cells

(Q).
If trees have woody stems covered with protective skin, then trees have woody stems covered with what? Answer choices: - heat energy - thin skin - protective skin - skinny cells - white skin - Chlorophyll - Organic compounds - looseness
(A).
protective skin