What system includes oceans, lakes, rivers, and groundwater?
a.
geosphere
b.
hydrosphere
c.
atmosphere
d.
biosphere

the answer is: B. Hydrosphere
Hydrosphere is any part of Earth that contain water. Since it contain water, lakes, river, and groundwater are a part of our hydrosphere. This system is responsible to provide various important nutrients that support the living of all organisms on the Earth's surface

This is what i did 45-5=4040÷4=10so there are 10 white marbles but am not sure is just a question that am not sure

From our previous experiment, we examined how many drops a penny can hold - and place drops of salt water on the penny after recording 5 trials each, take the average of each solution.