Ice floats<span> on water </span>because<span> hydrogen bonding makes liquid water unusually dense</span>
Hello!
.
The answer to your question is "asthma".
.
In its earliest medical application, the herb from which amphetamines are derived was used as a treatment for asthma.
:)
I'm not sure but I think the answer is A. Plants. Then again I'm not 100% sure that this is correct
Rigid skeletons are formed from materials including chitin (in arthropods), calcium compounds such as calcium carbonate (in stony corals and mollusks) and silicate (for diatoms and radiolarians).
