Most organisms breathe using oxygen or carbon dioxide. where do these gases come from on land? air offspring homeostasis shelter

In an energy pyramid, which level has the most available energy?

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.