Dr. bennett does an experiment that leads him to invent a machine that can turn salt water into fresh water. it is very slow and costly. he continues his research to improve on his original invention and finds a way to make it work more quickly and inexpensively.
which of the following ideas does this illustrate?
a. scientific research can be based on the results of previous experiments.

b. scientific research is only useful for inventing machines.

c. scientific research is always expensive and pointless.

d. scientific research is never based on the results of previous experiments.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

well first you need the sample of the temperature and gas level. i couldnt write a hypothesis unless i had some data. i think temperature changes will effect volumes of gas because gas changed into a solid or liquid at specific temperatures.