Explain how index fossils can be used to date newly discovered fossils. Identify another method that could be used to determine the age of the fossil.
Explain why determining the age of the new fossil find is important to scientists.

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h, o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

How are the testes and ovaries similar? a. both produce sex cells. b. both connect internal reproductive organs to the exterior. c. both transport sex cells from their site of production. d. both store mature sex cells.