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.
Basically no one knows that an earthquake is coming until it's happening.
People don't have time to evacuate because they don't know that an earthquake is going to take place , in other words the earthquake takes them by surprise.
The bivalve that was a keystone in Iowa, making sure the water stayed clean and filtered, is shellfish.
<h3>What are shellfish?</h3>
Shellfish is a term used to describe the fishes that have exoskeleton and are used to eat.
The shellfish is divided into two groups:
- Crustaceans: shrimp, prawn, lobster, etc
- Molluscan/ bivalves: oysters, clams, mussels, etc.
So, the molluscan are believed to keep the water bodies clean
Thus, the keystone species is shellfish.
Learn more about shellfish
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The temperature is the independent variable in Jerome's experiment.
Explanation:
Simone has to at least skip 1 or 2 days of practice. he is already In the game, but lacks the necessary control of healthy carbohydrates in his diet.
carbohydrates is what gives everyone energy..
healthy carbs:= more fruit, starchy veggies like corn, peas, pasta,whole grain bread plus lean protein can help store more carbs in the fat layer of the body. when in active motion, muscles release bursts of energy, (fight or flight response)..
gives the xtra calories and protein to muscle structure...
