The basic unit of structure and function in living things. (a)  

Made of a single cell. (a)  

Consisting of many cells. (a)  

Any change or signal in the environment that can make an organism react in some way. (a)  

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

The mistaken idea that living things arise from nonliving sources. (a)  

The condition in which an organism's internal environment is kept stable in spite of changes in the external environment. (a)  

The scientific study of how living things are classified. (a)  

The most basic level of organization in the classification of organisms. (a)  

The process by which unrelated organisms evolve similar characteristics. (a)  

A tiny, nonliving particle that enters and then reproduces inside a living cell. (a)  

An organism that a parasite lives with, in, or on and provides a source of energy or a suitable environment for the parasite to live. (a)  

A substance used in a vaccination that consists of pathogens that have been weakened or killed but can still trigger the body to produce chemicals that destroy the pathogens. (a)  

A eukaryotic organism that cannot be classified as an animal, plant, or fungus. (a)  

Not affected, harmed, or destroyed by something. (a)  

A plant that has true vascular tissue for transporting materials. (a)  

An animal with a backbone. (a)  

An animal without a backbone. (a)  

A body structure that is composed of different kinds of tissues that work together. (a)  

A vertebrate whose body temperature is regulated by its internal heat, and has skin covered with hair or fur and glands that produce milk to feed its young. (a)  

Having the characteristic of having closely identical features on both sides of an imaginary center dividing line. (a)  

A thin, flexible barrier that surrounds a cell and controls which substances pass into and out of the cell. (a)  

The thick fluid region of a cell located inside the cell membrane or between the cell membrane and the nucleus. (a)  

Rod-shaped organelles that convert energy in food molecules to energy the cell can use to carry out it's functions. (a)  

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

A sac-like organelle that stores water, food, and other materials. (a)  

The job or purpose of a specific structure or organ within an organism. (a)  

An instrument that makes small objects look larger. (a)  

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

To be able to tell one object from another by identifying key differences. (a)  

To be able to tell one object from another by identifying key differences. (a)  

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

A property of cell membranes that allows some substances to pass accross it, while others can not. (a)  

The process by which molecules move from an area of higher concentration to an area of lower concentration. (a)  

The process by which the cell membrane takes particles into the cell membrane by changing shape and engulfing the particles. (a)  

The process by which the vacuole surrounding particles fuses with the cell membrane, forcing the contents of the cell. (a)  

The first stage of the cell cycle that takes place before cell division occurs, during which a cell grows and makes a copy of its DNA. (a)  

The process by which a cell makes a copy of the DNA in its nucleus before cell division. (a)  

The second stage of the cell cycle, during which the cell’s nucleus divides into two new nuclei and one set of DNA is distributed into each daughter cell. (a)  

A series of connected events that happen in a specific order. (a)  

An organism that cannot make its own food, but gets food by consuming other living things. (a)  

A green photosynthetic pigment found in the chloroplasts of plants, algae, and some bacteria. (a)  

The place where something comes from; the point where something begins. (a)  

To use a combination of materials and processes to create something new. (a)  

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

A living or once-living part of an organism’s habitat. (a)  

A nonliving part of an organism’s habitat. (a)  

All the different populations that live together in a certain area. (a)  

An environmental factor that causes a population to decrease in size. (a)  

The measurement of how much mass of a substance is contained in a given volume. (a)  

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

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

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

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

Any form of water that falls from clouds and reaches Earth’s surface as rain, snow, sleet, or hail. (a)  

The individual objects or parts that combine or work together to form a whole. (a)  

The passing of traits from parents to offspring. (a)  

A number that describes how likely it is that a particular event will occur. (a)  

An organism’s genetic makeup, or allele combinations. (a)  

An allele whose trait always shows up in the organism when the allele is present. (a)  

An allele that is hidden whenever the dominant allele is present. (a)  

An organism’s physical appearance, or visible traits. (a)  

To support results with data. (a)  

Something that leads to or causes a specific result. (a)  

A threadlike structure within a cell’s nucleus that contains DNA that is passed from one generation to the next. (a)  

The series of events in which a cell grows, prepares for division, and divides to form two daughter cells. (a)  

A tool that geneticists use to map out the inheritance of traits. (a)  

The process that occurs in the formation of sex cells (sperm and egg) by which the number of chromosomes is reduced by half. (a)  

The structure formed when a chromosome divides during meiosis. (a)  

The second stage of the cell cycle, during which the cell’s nucleus divides into two new nuclei and one set of DNA is distributed into each daughter cell. (a)  

A set of peices or parts that are arranged in a certain way within a larger object, system, or body. (a)  

The job or purpose of a specific structure or organ within an organism. (a)  

The genetic material that carries information about an organism and is passed from parent to offspring.

The process by which amino acids link together to form proteins.

A series of connected events that happen in a specific order.

Any difference between individuals of the same species. (a)  

The 22 pairs of chromosomes that are not sex chromosomes. (a)  

Any change in the DNA of a gene or a chromosome. (a)  

A gene carried on a sex chromosome. (a)