Why are cells called the “basic building blocks of life?” 1. The human body is made up of over 100 trillion cells.
2. Cells are shaped like blocks.
3. Most cells can only be seen with the aid of a microscope.
4. Cells are the basic structure in all living things.

Drag each description to the correct location on the image. not all descriptions will be used. describe the parts of a comet. the frozen part of the comet the atmosphere of gases and dust formed when the nucleus vaporizes tail made of small, solid dust particles tail made of ions that appears to point away from the comet's orbit