(Q).
If arteries generally carry blood full of O2, then arteries generally carry blood full of? Answer choices: - He - Au - O3 - O2 - DDT - Ni - CO2 - gas
(A).
O2

(Q).
If animals in the frog family are the first true tetrapods, then the first tetrapods were? Answer choices: - major threat to health - remains of prehistoric life - in the frog family - running and lifting - competing for resources - warm-blooded - objects that have mass - graptolites
(A).
in the frog family

(Q).
If being buried under soil and mud changes peat into coal through extreme heat and pressure in wetlands, then where can peat, buried under soil and mud and through extreme heat and pressure, change into coal? Answer choices: - coastlines - alluvial - Sediment - uncontrolled - germany - wetlands - wind - deltas
(A).
wetlands