What occurs in a chemical reaction?

Which type of cancer resulted in the most deaths in 2007?

The reason cells expend large amount of energy to export Sodium ions from cells is because A) Sodium is poisonous for cells B) Sodium gradients are needed to make ATP C) Sodium gradients can be used to cotransport items in and out of cells D) Sodium

What happens to plants that are kept in the dark?

How are bacteria used in genetic engineering?

What fossil evidence was most useful in arranging the continents?

How are dichotomous keys used?

Which two statements about composite materials are true? -They're made up of more than one substance. -They have the same or similar properties as the materials used to make them. -They're always made of metal. -They're readily available in nature.

What is rna, in biology

Which statement describes the formation of our sun? A disk formed of long trails of stars coiled into a spiral. It formed an elliptical flattened disk. Heat and gases contracted within a nebula. Gravity pushed stars away from a center core.

Which molecule is synthesized by plants and is a major source of energy for plants and animals?