Scientists study ancient climates by looking at ice cores, tree rings, and pollen samples?

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

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

Explain the significance of thesaurus geographicus