Which two animals are able to generate internal heat to maintain their body temperature in a cold environment? parrot
snake
frog
dog
crocodile
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dog and parrot

Explanation:

Because they are warm blooded animals there for they are able to generate internal heat letting them maintain a constant temp no matter the temperature  in their surroundings

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds