Which of the following are chemical changes? Select all correct answers.
A. table salt dissolving in water
B. a liquid evaporating to form a gas
I C. a force causing a sheet of metal to bend
D. wooden logs burning to form ash
E. hydrogen and oxygen forming water

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million