What happens when a person who is allergic to ragweed encounters ragweed?

Why do the circulatory systems of land vertebrates have separate circuits to the lungs and to the rest of the body?

Convection currents in the Earth's mantle are responsible for the movement of tectonic plates. As shown in the diagram, heat from the Earth's core is the driving force that moves magma in a circular motion called "cells.

How many electrons does phosphorus have in its valence shell? a. 1 b. 2 c. 3 d. 4 e. 5

When cells divide during meiosis homologous chromosomes are randomly distributed to daughter cells and different chromosomes segregate what of each other?

Lipids are a poor source of stored energy. lipids are a poor source of stored energy. a. True b. False

If mitosis occurs in a cell but cell division does not occur·, what is the result.

Process least associated with producing genetic abnormalities

How would the contractile vacuole of a freshwater amoeba respond if the organism was placed in seawater? with more contractions with fewer contractions the contractions would suddenly cease with the same frequency of contractions

Which property of a star is closely related to its temperature? brightness color composition size

Difference between natural selection and evolution