Multicellular organisms grow by $........$ and unicellular organisms grow by $........$.

Choose the correct sentence$(s)$ regarding the ability of organisms to sense their environment and respond to stimuli.
$1.$ It is a characteristic of non-living things.
$2.$ It is a characteristic of living organisms.
$3.$ It could not be physical,chemical,or biological.

Which of the following is a complex biochemical process occurring in a living organism?

$1 \text{ Å}$ is equal to .....

Which of the following is an incorrect match regarding scale,level of organization,and scientific discipline?

$S$ Statement: Reproduction leads to an increase in the number of organisms.
$R$ Reason: In reproduction,organisms produce new individuals similar to themselves upon reaching maturity.
$(a)$ Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
$(b)$ Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
$(c)$ $S$ is true and $R$ is false.
$(d)$ $S$ is false and $R$ is true.