Coal was formed
a. from trees, ferns, and other plants that predate the dinosaurs
b. from remains of fossilized dinosaurs and the plants they fed on
c. from aquatic organisms buried under silt and sediment
d. beginning almost 800 million years ago

Which best describes the scientific process

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

20 the compound al(nh3)2 has atoms of nitrogen.