because the door is metal and metal conducts electricity well
The correct statement is this one: Molecules move from areas of high concentration to areas of low concentration.
This is true also for diffusion outside of organisms, for example diffusion of gases in a room.
The other options are false.
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D. Because posterior is to the back and inferior is downward. It also doesn't say about which knee or which side of the knee. So you can cautiously infer answer D.
Well, there are a lot of reasons that we are not clones of our parents. First, genetics get involved. Our parent's DNA mixes to make us a bit more random, with a combination of their DNA.
Secondly, environment actually plays a role in how we are different. Not wanting to get to complicated, but factors in the environment that our mothers were in can actually alter what genes are expressed!
