(Q).
All life relies on a relatively narrow range of pH, or acidity, and all organisms have life cycles. Given these facts, what relies on a relatively narrow range of acidity among the following options: - weathering - mammals - density - Most plants - organisms - animals - barnacles - volume
(A).
organisms

(Q).
Playing is just one of many ways that mammals and other animals learn how to behave, and games are for fun, to play, and the folks there are a bunch of fun. Given these facts, what is one way that mammals and other animals learn how to behave among the following options: - looseness - killing for sport - Riding a bike - Movement - exercise - watching sports - hitting rocks - games for fun
(A).
games for fun

(Q).
Awindmill converts wind energy into electricity primarily by using mechanical energy, and windmills are machines operated by windpower. Given these facts, what does windpower get converted into among the following options: - magnet - energy - direct energy - wind - water - energy usage - electricity - animal transport
(A).
electricity