If you have a mechanical advantage of 2 with a block and tackle system. How much force do you have to pull with? 1. Three times
2. Twice
3. Half
4. one quarter

When species lose their habitats they may..

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

Error analysis: what might be the reason that some of your percentages didn't exactly match your predicted results? gametes aren't responsible for inheritance. mice don't have large litters, so the sample size was not large enough. the wrong type of mice were used.