N 1. In early embryonic development, the cells start to differentiate based on
O a chemicals secreted by the blastocyst.
b. hormones secreted by the uterus.
c. their location.
d. amniotic fluid produced by the placenta.
e. their layer.

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a