Which statement describes electromagnetic waves with
wavelengths greater than 700 nanometers?
O They take the form of heat.
They can cause skin cancer and sunburn.
They are some of the shortest waves.
O They can be seen by human eyes as visible light.

Which describes radioactive decay of a substance

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

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes