Answer:
<em>The combined law is:</em>

See the derivation below.
Explanation:
<em><u>1. Boyle's law:</u></em>

<em />
<u><em>2. Charles' law:</em></u>

<em><u>3. Gay-Lussac’s law</u></em>

<u>4. Summary:</u>
Mulitply PV by V/T and P/T

Thus:

Which is<em> the combined law.</em>
Answer:
Matthias Schleiden, Theodor Schwann, and Rudolf Virchow
Explanation:
There is no graph but the reason people who have aids cant fight it off is because it is an immune disease it quickly weakens the immune system and makes a persons body too weak to fight anything off.
Unsaturated hydrocarbons are those in which each carbon atom is attached to as many hydrogen atoms as it possibly can. There can be no double bonds or non-hydrogen functional groups, since these detract from the maximum possible number of hydrogens that each carbon can be attached to (in the case of double bonds, two carbons are bonded to each other when they could alternately be bonded to one more hydrogen each).
All of the alkanes (including the cycloalkanes) are saturated hydrocarbons. Substituted alkanes, alkenes, alkynes, and their cyclic counterparts are all unsaturated.
Answer:- A.
and 
Explanations:- In general, 
In acid-base reaction the acid gives hydrogen ion and the base gives hydroxide ion and these ions combine to form water. Rest of the ions from acid and base combine to form the salt.
Nitric acid breaks to give hydrogen ion and nitrate ion. Similarly, NaOH breaks to give sodium ion and hydroxide ion. Since, hydrogen ion and hydroxide ions form water, the sodium ion and nitrate ion forms the salt, sodium nitrate.
The reaction is shown as:

So, the right choice is A.