Earth's crust is part of which of earth's layers?

a. the litosphere
b. the upper mantle
c. the lower mantel
d. the asthenosphere

When does dna replication(make a copy of itself)?

Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen

Freckles are a dominant trait in humans. both of the girls have the genotype ff for freckles. if either one marries a man with no freckles, what are the chances that their children will have freckles?