What is the name of an animal without a notochord, but has a backbone?

What are the student's observations and inferences before he starts his investigation?

Are the layers of rock above and below the coal older or younger?

Aplant with dark red flowers is crossed with a plant with white flowers. all of the offspring have dark red flowers with white spots. the alleles got flower color in this plant are both dominant both recessive codominant incompletely dominant