When platy materials have a parallel alignment a rock is apex

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.

If a human has 23 pairs of chromosomes in every muscle cell of its body how many chromosomes will be in a human egg or sperm