Answer:
Explanation:
Mechanical advantage is given by the ratio of output force by input force.
= Output force = 
= Input force = 
So,
The mechanical advantage of the pulley's is .
The answer youre looking for is A
Answer:
slow change
Explanation:
If the change is slow they have time to adapt. An example of a fast change is human deforestation. With their habitat suddenly removed, the organisms living there will have to find new shelter and food fast. It's likely that they'll not even be able to find anything to survive off of and die, because organisms tend to have very specific needs. For example, pandas would go extinct if bamboo was eradicated.
Freshwater fish would not be able to adapt if it was suddenly dropped into salt water. They would die. An example of a slow change would be the slow addition of salt to freshwater. Fish that are better able to survive within higher levels of salinity will be more likely to reproduce. Slowly through reproduction a new type of fish suited to salt water may be developed over several generations.
I think the best way to remove mud from water is reverse osmosis. But if your're think about doing it by hand than I would boil the water so the mud collects on the bottom. Then I would put a plastic wrap on top of the container while a small cup is inside the bowl. And then put a rock on the plastic wrap in the center on top of cup.
Explanation: The water vapor rises because of vaporization, and then collects as condensation and drips into cup-collection as pure water
I got this from a lab i did before, so all credits don't go to me =><span />
The answer is A, cells, as viruses infiltrate cells, make copies of themselves in them, and then lyse the cell and spread.
