Which stain is used to prepare an on onion peel is a slide why do we stain the onion peel

The meselson-stahl experiment demonstrated that dna replication is semiconservative. in the figure, semiconservative replication is illustrated by

If jane has the blood type ab and marries john who has type o blood what are the possible phenotypes of their first kid?

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?