The heart is about the size of your clenched fist

path of blood from the right ventricle through the lungs and back to the heart.

Path of Blood: supplies the blood to the kidneys

is a muscular organ in the circulatory system that is responsible for pumping blood throughout the blood vessels to our body

The heart pumps blood and substances around the body in tubes

Classes of Blood Vessels that carries blood away from the heart.

known as the river of life

-Takes charge of the complex brain fun actions, such as intelligence, memory, behaviour, and feelings. It is composed of the brain and spinal cord.

The largest part of the brain, the cerebrum has 2 hemispheres (or halves).

the reaction of the organism to it is the _______

Wear a protective helmet for sports

An animal without a backbone

Animals like Lizards, turtles, crocodiles, and alligators are examples of __________

______ It is an informal group consisting of three divisions of non-vascular land plants (embryophytes): the liverworts, hornworts and mosses.

kind of reproduction that requires a fusion of male cells in the pollen grain with female cells in the ovule

both organisms benefit from the association

Important of Forest:

provides habitat for animals and plants

a push or pull exerted by one object on another

Effects of force on the objects:

It cannot transfer energy to an object to make it move.

is a pushing force exerted by a material when it squeezed or compressed

when the force pushing on the box is larger than the maximum static friction force, the box begins to slide.

When you pick things up, you're _______.

Which requires more force to move it?

What pulls a ball back to earth?