many trees in pennsylvania loose their leaves in the autumn and regrow their leaves in the spring. which graph shows the weather change that results in this pattern.

Variety of living organisms; includes genetic, species, and ecological types.

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.