1. How did scientists discover that all living things are made of cells? 2. How did Pasteur’s experiment with the flasks help disprove the idea that living things
could just appear or come from nonliving things like water and air?

3. Why are nutrients needed for living things? Describe the difference between living and nonliving things.

Here is your answer : )

1.Around 1850, Virchow saw cells dividing and added that living cells arise only from other living cells. These ideas led to cell theory, which states that all organisms are made of cells, all life functions occur in cells, and all cells come from other cells.

2.Pasteur's experiment with the flasks helps disprove the idea that living things could just appear or come from nonliving things like water and air because the flask without a lid grew microorganisms that cam from a living thing not air or water.

3.Nutrients are chemical substances found in every living thing on Earth. They are necessary to the lives of people, plants, animals, and all other organisms. Nutrients help break down food to give organisms energy. ... Plants and other autotrophs absorb nutrients from soil and water.

Hope it helps

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom