What do the letters represent in the chemical formula CH2O? O A. compounds
O B. elements
O c. mixtures
O d. solutions
Hel

Tlymphocytes mature in the? a. thyroid gland. b. bone marrow. c. spleen. d. thymus.

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?