How is it possible that only 92 elements are found in the natural world but there are millions of different types of molecules?

When two atoms share a pair of electrons, the bonding is referred to as

A leaf cell has a very low concentration of salt. what would happen to the leaf cell if it were placed in a highly concentrated salt solution?

How can you yell if something is living when you are looking at it through a microscope

A mixture is a combination of two or more substances in which each substance retains its individual characteristics

What form of nitrogen do plants take in

Explain why having only one ventricle makes the circulatory system less efficient than having two ventricles.

What type of bond is shown below, where electrons are shared between the bonded atoms? A) covalent bond B) ionic bond Eliminate C) hydrogen bond D) cellular bond

Photosynthesis is an example of A. an exothermic reaction. B. an endothermic reaction. C. a reaction that gives off heat. D. a reaction that emits energy.

A sedimentary rock is found to be 300 million years old. Which type of organism is NOT likely to be found in the rock? a) insects b) mammals c) fish d) land plants

James is making models of plant and animal cells using objects supplied by his teacher to represent organelles. For one cell, he will place the objects in a shoebox. First he fills a balloon with water and places it in the shoe box.