How are selective breeding, cloning and genetic engineering similar? A. They are all controlled by humans

B. They all involve the use of enzymes that cut DNA

C. They all begin with the use of udder cells

D. They are all controlled by nature

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

What is one energy transformation that is taking place in the photo? radiant energy to thermal energy thermal energy to nuclear energy chemical energy to thermal energy radiant energy to chemical energy