They ensure they leave the system and they also ensure that people get the nutrients they need.
Answer:
Polyploid cells have more than 2 sets of each chromosome. Hope that helped! :)
Water cycles through organisms and rivers.
Answer:
here it is
Explanation:
The Sun's gravitational pull keeps our planet orbiting the Sun. The motion of the Moon is affected by the gravity of the Sun AND the Earth. The Moon's gravity pulls on the Earth and makes the tides rise and fall every day.
