Blood is a mixture of a variety of materials. some of the materials are dissolved in the fluid portion of blood. other materials, such as blood cells, do not dissolve but move along with the blood.

compost can be added to topsoil as a:

pesticide

a physical change is being made.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u