Which two elements make up more than 90 of the dry weight of plants?

Plants grow in many different shapes and sizes. Much of their shape depends on an internal structure that is composed of carbon-containing molecules such as cellulose and lignin.

When studying the halogens (group 17) on the periodic table, how does the number of the valence electrons change as the energy level is increased? A) The total number of valence electrons does not change, it remains 7.

In an oxidation-reduction reaction, the reducing agent In an oxidation-reduction reaction, the reducing agent gains electrons and loses potential energy. loses electrons and loses potential energy. gains electrons and gains potential energy.

What are examples of electrical energy

How do I turn kg into g and then back into kgs

Which of the following is not a skill scientist use to learn about the world A. Predicting B. Observing C. Inferring D. Scientist use all of the above skills

When you overshoot during titration what is the result

The transmission of heat requiring the movement of a liquid or a gas is A. transduction. B. convection. C. radiation. D. conduction

The molecular formula HOH is an example of an

Which choice is an example of an endothermic process? . conversion of steam to ice . conversion of steam to water . conversion of water to ice . conversion of ice to steam