Answer:
Venus and Mercury are the only planets in our solar system that do not have moons. Venus and Mercury have a gravitational pull that is weaker than the gravitational pull of the Sun, so they wouldn't be able to hold onto their own moon.
Because ounce and inch system are too big thus less sensitive.
Using metric systems like milliliter and millimeter might be better since you can find smaller differences. If you are using a system that less sensitive you can observe small differences and might need to grow the trees bigger than it should.
A. both indoor and outdoors environments can pose potential risks for an individual's health.
