Practice 2: Check all of the following that would be considered benefits to an experimental investigation.
Can recreate outside conditions to speed up natural processes
Can be repeated and verified.
Variables are only observed in the outside environment
Can test products before they are given to humans
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-PLEASE HELP

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

+15-35=-20

going in opposite directions