Answer:
D
Explanation:
If you look under a microscope it would be easy to see the cell wall and the chloroplast. in the picture that I put you can easily see the green which is the chloroplast and the cell wall which is the thin outer layer of the cell.
Answer:
Humans—and other complex multicellular organisms—have systems of organs that work together, carrying out processes that keep us alive. ... Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs.
Explanation:
<u>Answer:</u>
<em>The movement of air in a hot air balloon makes it move up into the sky.
</em>
<u>Explanation:</u>
Convection takes place in fluids. Hot fluids are less dense than cold fluids and the difference in the densities determine the direction of flow of fluids. <em>Less dense fluid moves up and the denser fluid take its place. </em>
Thus hot air rises up and cold air fills its place. The hot air balloon contains burner which <em>pumps hot air into the balloon.</em>
Thus the air inside the balloon will be hotter than the air outside the balloon. <em>Thus the hot air rises up carrying the balloon forward.
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If the pressure is rising, the density will increase.
Answer:
Explanation:
Spongy bone is also called cancellous or trabecular bone. It is found in the long bones and it is surrounded by compact bone. ... Trabeculae are spaces created in the tissue by thin areas of osteoblast cells. As a result, trabecular bone has about 10 times the surface area of compact bone.
