Which of these represents the female gametophyte generation of an angiosperm? a. an embryo sac b. an ovule c. an ovary

Use the drop-down menu to complete the statement. an electron in the first energy level of the electron cloud has an electron in the third energy level.a. a lower energy thanb. a higher energy thanc. the same energy as

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.