Answer:
i think so 1 and 3 is the correct answer...................
The answer is A as they had to spend time growing or looking for food as food was scarce back then.
Answer:
In an experiment in which blood pressure medication is tested, one group is given the blood pressure medication while the control group is given a placebo pill.
In a test of anxiety treatment, one group attends individual therapy sessions and receives a new medication. The control group receives only an inert pill.
A treatment for drug addiction is being tested. A group of meth addicts are given the treatment while the control group is given the placebo.
Researchers are testing the effectiveness of a drug intended to reduce symptoms of Crohn's disease. Many sufferers of Crohn's disease are recruited for the effort and the group that receives the placebo is the control group.
A treatment for hair loss in men is being tested. Men of the same age range are gathered. One group receives an application with the active ingredient while the control group receives an application that appears the same but does not have the active ingredient in it.
hope this helped you
Answer:
Melting point is the temperature at which solid and liquid phases of a substance are in equilibrium.
Boiling point is the temperature at which its vapour pressure is equal to the external pressure.
