A large oval organelle that contains the cell's genetic material in the form of DNA and controls many of the cell's activities

The basic unit of structure and function in living things.

An instrument that makes small objects look larger.

A widely accepted explanation of the relationship between cells and living things.

Convert energy stored in food to energy the cell can use to live and function. The "powerhouse" of cells

An organelle in the cells of plants and some other organisms that captures energy from sunlight and changes it to an energy form that cells can use in making food

This process allows large particles to leave a cell

The process in which cells grow, prepare for division, and divides to form two daughter cells

The first stage of the cell cycle

A process in which the cell makes a copy of the DNA in its nucleus before cell division

Producers, who are able to create their own food in the form of glucose, an energy-giving sugar

A process in which cells capture energy in sunlight and use it to make food

An organism that cannot make its own food

The green photosynthetic pigment found in the chloroplasts of plants, algae, and some bacteria

The process in which oxygen and glucose undergo a complex series of chemical reactions inside cells, releasing energy

The release of energy from food without using oxygen

A group of similar cells that perform a specific function is called:

A body structure composed of different kinds of tissues that work together

A group of organs that work together to perform major functions

A change or signal in the environment that can make an organism react in some way

An action or change in behavior that occurs as a result of a stimulus

Organs that produce and release chemicals either through tiny tubes are called:

Which chemical is produced by an endocrine gland?

An action or change in behavior that occurs as a result of a stimulus.

The process by which your body breaks down food into small nutrient molecules is called?

The substances in food that provide the raw materials for the body’s cells to carry out all their essential processes are called?

An energy-rich organic compound, such as sugar or starch, is made of the elements carbon, hydrogen, and oxygen.

A fluid is released from glands in the mouth and plays an important role in both mechanical and chemical digestion. What is it?

Proteins that speed up chemical reactions in the body are:

The system that includes the cardiovascular system and the lymphatic system is the?

Blood vessels that carry blood away from the heart are:

Blood vessels that carry blood back to the heart

What is the process of removing wastes from the body called?

A cell that carries information through the nervous system is called?

The part of the CNS (Central Nervous System) located in the skull that controls most functions of the body

A thick column of nervous tissue that links the brain to most of the nerves branching out through the body.

An automatic response that occurs rapidly and without conscious control

The process by which a system is turned off by the condition it produces

Asexual reproduction is different from sexual reproduction in that the offspring of asexual reproduction

Which is not a stimulus that can trigger tropisms in plants

A reproductive process where two parents combine their genetic material to produce a new organism which differs from both parents

A specific characteristic that an organism can pass to its offspring through it's genes

A sequence of DNA that determines a trait and is passed from parent to offspring

The process by which an offspring receives genes from its parents

The transfer of pollen from male reproductive structures to female reproductive structures in plants

The ripened ovary and other structures of an angiosperm that enclose one or more seeds

The sprouting of the embryo out of a seed; occurs when the embryo resumes its growth following dormancy

The way an organism reacts to changes in its internal conditions or external environment

A response to a stimulus that is inborn

A chemical released by one animal that affects the behavior of another animal of the same species

Behavior patterns related to how animals mate

The regular, seasonal journey of an animal from one place to another and back again

A period of time when an organism's growth or activity stops

A process in which an animal's body undergoes major changes in shape and form during its lifecycle

A living thing

An environment that provides specific organism needs to live, grow, and reproduce

A living or once living part of an organism's habitat

A nonliving part of an organism's habitat

The different populations that live together in a certain area

All the members of one species living in the same area

The community of organisms that live in a particular area, along with their nonliving environment

An environmental factor that causes a population to decrease in size

An organism that can make its own food

An organism that obtains its energy by feeding on other organisms

An organism that gets energy by breaking down biotic wastes and dead organisms and returns the raw materials to the soil and water

A series of events in an ecosystem in which organisms transfer energy by eating and by being eaten

The pattern of overlapping feeding relationships or food chains among the various organisms in an ecosystem

A diagram that shows the amount of energy that moves from one feeding level to another in a food web

The rule that energy cannot be created or destroyed

The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change

The process by which molecules at the surface of a liquid absorb enough energy to change to a gas

The change in state from a gas to a liquid

Any form of water that falls from clouds that reaches Earth's surface as rain, snow, sleet, or hail