Adog may become frightened and cower when it hears loud thunder. this is an example of a reaction to what kind of stimuli?

chemicals

light

touch

sound

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's