SCIENCE

Form 2

SKINSkin holds everything together. It

also: protects our bodies helps keep our bodies at just the right

temperature allows us to have the sense of touch Don't Miss Your

Epidermis The skin is made up of three layers, each with its own

important parts. The layer on the outside is called the epidermis (say: eh-pih-dur-mis). The epidermis is the

part of your skin you can see.

PHOTOSYNTHESISGreen plants are producers. This means that they

can survive without animals! They can make lots of organic chemicals from a few simple inorganic chemicals. They need simple things like carbon

dioxide and water and can make complex things like sugar, starch, fat, and proteins.

Plants get their nutrients from the environment. Carbon dioxide comes from the air (unless they are aquatic plants, in which case they get it from the

water surrounding them). They get water from the soil. They also need other inorganic nutrients like

nitrate, sulphate and phosphate. A few plants cannot get nitrate out of the soil so they have to eat animals to get the nitrogen which they must have for growth.

FOOD PYRAMID

Symbols, such as a pyramid, illustrate how the pieces of a healthy diet fit

together. The base of the pyramid is typically made up of foods that should

be the bulk of your healthy diet. In contrast, foods you should eat in

smaller amounts or less frequently are shown in the smaller sections of the

pyramid. The same principle applies to the dinner plate — half of the plate

consists of fruits and vegetables, which should be the bulk of your diet.

SKELETONSHydrostatic Skeletons:

- consists of fluid held under pressure in a closed body compartment

- main type of skeleton in most Cnidarians, Flatworms, Nematodes and

Annelids

- can control their form and movement by changing the shape of the fluid filled

compartments with muscles in the body wall

- offer no protection of support for large land animals

GRAVITATIONAL FORCE

What is the Gravitational Force? This is NOT a force of CONTACT. Any object on the

Earth or at least close to Earth, will experience a gravitational force. For example, when one

shoots a basketball, the force of gravity acts to pull the ball back

to the floor.

AIR PRESSURE

Air pressure is the force exerted on you by the weight

of tiny particles of air (air molecules). Although air

molecules are invisible, they still have weight and take up space. Since there's a lot of "empty" space between air

molecules, air can be compressed to fit in a

smaller volume.