Select the correct answer. How is relative-age dating used to determine the ages of fossils?
A.
by observing the formation of sedimentary rocks
B.
by using radioactive isotopes
C.
by estimating the number of fossils in a particular region
D.
by the formation of igneous rocks
E.
by identifying the way the fossils were formed

In a classic experiment using pea shape, mendel conducted two separate genetic crosses. in the first cross the parent plants were “true breeding” for pea shape; one had round peas ( r )and the other had wrinkled (r). the first cross produced a filial 1 generation of all round peas. in the second cross, mendel bred plants from the filial 1 generation. this cross produced different results. out of approximately 1000 plants, about 75% were round and 25% were wrinkled.

7. describe two strategies that parents can use to cope with stress. 8. describe the three types of childcare available to families. 9. what can parents do to be more involved in their children's education at home and at school? 10. which factors should a parent consider when choosing a childcare option?

20 the compound al(nh3)2 has atoms of nitrogen.