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Cells are the smallest structural and functional unit of an organism, Consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell, which is either eukaryotic or prokaryotic.

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Diffusion is one of the substances move into and out of the cell. The concentration of a substance that a cell uses to as oxygen, is low inside the cell. Outside the cell, the concentration of the substance. is higher.  Diffusion is basically the same thing as Osmosis. But, Osmosis is only doing this to water particles instead and Diffusion is anything.

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A group of cells that are all similar in shape and function is called a tissue. Tissues are often organized into larger structures called organs. Many organs are composed of several different types of tissues. Each organ has at least one function.

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Your immune system defends you by destroying invaders. One defense is to attack the invader directly with the white blood cell. Once the invaders are engulfed by the cells , the white blood cells release special chemicals that destroy the invaders, but also destroy the white blood cell. Another way that your immune system defends you by using antibodies. Antibodies are made by a special type of white blood cell. Antibodies are large molecules the lock onto invading organisms.

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Bacteria are among the most primitive and also most plentiful organisms on Earth. Bacteria are said to be very successful because they have survived and changed little over several billion years. Other parasites can live only live by invading the body of an animal or plant. Still others can live with little or no oxygen. Bacteria, which are prokaryotic cells, are different from animal and plant cells in that they have no nucleus, no mitochondria and no ribosomes.

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A group of cells is better than one big singular cell because they can work as a team.  An example of this is with space, you first start out with a star, than a group of stars, after a galaxy and than the observable universe. A group of cells are called a tissue. After that many tissues are composed of organs.

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Well, protists are a collection of unicellular organisms that are neither plants or animals. They only contain Nucleus and organelles. Some examples of this are... Diatoms, Euglena, Amoebae, and Paramecia

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Fungi is a multi cellular, and unicellular. Virus is a genetic information and bacteria is a microorganisms.

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The is a large, thin sheet of muscle that spreads across the
chest cavity below the lungs. The diaphragm is largely responsible for breathing. As well, the muscles between the ribs help with the
movements of the chest that make you breathe. is the
regular movement of air into and out of the lungs. When the
diaphragm and the muscles between the ribs contract, you inhale. The chest cavity becomes larger, and air is forced into the lungs. When the diaphragm and the muscles between the ribs relax, you exhale. The
chest cavity becomes smaller, and air is forced out of the lungs

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All animals take in oxygen and release carbon dioxide in the process of respiration. Large animals have many trillions of cells, so they cannot depend on diffusion alone to ensure that each cell gets the oxygen it.

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The circulatory system circulates blood around the body. The blood carries oxygen-rich and nutrient-rich fluids to the body cells and picks up carbon dioxide and other waste to be eliminated from the body.

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-Red blood cells: The blood cells that carry oxygen and it is the hemoglobin which permits them to transport oxygen
-White blood cells: One of the cells the body makes to help fight infections.
-Skin cells: The body's outer covering, which protects against heat and light.
-Brain cells: A cell in the tissue of the brain.
-The Nucleus: The is the control centre. It directs all of the cell’s activities. In plant and animal cells, the nucleus is surrounded by a membrane. Cells with a nuclear membrane are known as In some
one-celled organisms, such as bacteria, the nucleus is not surrounded by a membrane. These cells are known as Chromosomes.
-Chromosomes: Are found inside the nucleus. contain DNA or genetic information, which holds “construction plans” for all
the pieces of the cell. This genetic information is duplicated and passed.on to other identical cells.
-The Cell Membrane: Holds the contents of the cell in place and acts like a gatekeeper, controlling the movement of materials, such as nutrients and waste, into and out of the cell. The cell membrane consists of a double layer of fat molecules.
-The Cytoplasm: Most of the cell is a watery fluid that contains everything inside the cell membrane and outside the nucleus. Many of the cell’s
chemical activities take place in the cytoplasm. The cytoplasm allows materials to be transported quickly between the structures in the cell. The cytoplasm also stores wastes until they can be disposed of.
-The Vacuole:
Each vacuole is filled with fluid. A is used to store water and
nutrients, such as sugar and minerals. A vacuole is also used to storewaste and to move waste and excess water out of the cell.

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I got this information from the textbook. All credits are given, to their respected owners.