HELP PLEASE Extend your thinking: Many chemical properties are determined by the number of valence
electrons. Elements with the same number of valence electrons will have similar properties.
Which element has similar properties to lithium? Beryllium?
Explain:

What does homeostasis means in biology?

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.

Are the layers of rock above and below the coal older or younger?