Answer:
c. A piece of mesh, keeping some things out and letting some things in
Explanation:
The cell membrane of a cell is described as "selectively permeable". Permeable means things can go through it, but the word selectively is the important part. It lets things in, but it also keeps things out. This way it can regulate the different things that go in and out of the cell. It allows certain molecules that provide the cell nourishment and other things that help it function, and at the same time, it allows waste to move out of the cell. Not all needed molecules can go through the "mesh-like" membrane, that why some of them need help.
Answer:
Explanation:
The protons and neutrons huddle together in the nucleus, or center, of the atom, while the electrons spin around the nucleus. ... An element is a pure substance that is made from one single type of atom. For example, gold is an element that is made up of gold atoms. Oxygen is an element made up of oxygen atoms.
Your answer would be cumulus clouds.
Answer:
All Natural Resources fall under two main categories: Renewable and Non-renewable Resources. ... Non-renewable resources are those that cannot easily be replaced once they are destroyed.
Explanation:
hope this helps
C. Nitrogen is found in both DNA and proteins.
