What are Cells? and Let's Get Organized! Reading

All living things are made up of what?

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They are the smallest whole things that can be called __________.

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Match the correct definition to the vocabulary word.

• The simplest cells in existence.

• organism

• The building blocks of life.

• multicellular

• Made of many cells.

• bacteria

• Made of only one cell.

• unicellular

• Any living thing.

• cells

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Match the following specialized cells to their job.

• support and protect the body

• bone cells

• movement of body parts

• immune cells

• send and receive messages

• nerve cells

• fight disease

• skin cells

• cover and protect your body

• muscle cells

LET'S GET ORGANIZED: Living things are made up of one or _____________ cells.

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Unicellular organisms made up of only one cell.

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Scientists who study cells.

Match the following:

• Organ system

• Group of similar cells working together.

• Organs

• Have the same jobs when are similar shapes and sizes.

• Organelles

• Similar organs doing the same job.

• Tissue

• Perform specific functions for the cell. "Tiny organs."

• Cells

• A structure that is made of two or more different tissues working together.

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Your heart, arteries, veins, and capillaries make up which organ system?

• cardiovascular

• nervous

• circulatory

• muscular

What are the 7 main systems that work together to create a human being?