When a solid melts
a. the temperature of the substance increases.
b. the temperature of the substance decreases.
c. heat energy leaves the substance.
d. heat energy enters the substance.?

An observation that requires measurement is called quantitative observable or qualitative

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397