The process by which water changes from a liquid to a solid is called freezing. Freezing is the process in which a li…

The process by which rocks change form or composition is called metamorphism. Metamorphism is a process that changes …

Rocks are pushed to the surface through a process called uplift. This process is caused by the movement of tectonic p…

The groups of sporangia borne on fern leaves are called sori (plural) or sorus (singular) .  The sporangia contain spo…

Fibroblasts are cells that produce white fibrous tissue under normal and pathological conditions. They contain collag…

Ferns have complex leaves called  megaphylls  that are more complex than the microphylls of clubmosses . The leaves of…

Natural selection is one of the basic mechanisms of evolution, along with mutation, migration, and genetic drift .  It…

Dominant alleles are the alleles that give the phenotype, masking over the other phenotype while recessive alleles are…

Innate behaviors are those an animal will engage in from birth without any intervention.  Learned behavior is somethi…

The carbon cycle is nature’s way of reusing carbon atoms, which travel from the atmosphere into organisms in the Earth…

Hormones are molecules that act as chemical messengers in the body’s endocrine system .  They regulate various biologi…

The liver produces bile that helps digest fats and also helps remove toxins from the body.

Homeostasis is the maintenance of a stable internal environment in an organism.

Red blood cells carry oxygen from the lungs to the rest of the body.

Transcription is the process by which DNA is used as a template to make RNA.

The process by which living organisms take in oxygen and release carbon dioxide.

Leaves change color in autumn because they contain an abundance of chlorophyll which makes them appear green. As autumn…

If the natural flow of energy in an ecosystem is disrupted, it can have a significant impact on the balance of nature…

Growth and development are two related but distinct processes that occur in living organisms . Growth refers to an in…

Involuntary actions are controlled by the autonomic nervous system, which is a network of nerves that regulates uncons…

Chemical control is a method used to control plant diseases by inhibiting the growth of or killing disease-causing pa…

The theory of evolution is a scientific theory that explains how species of living things change over time.   It is o…

Autogamy is a type of self-fertilization that occurs when two gametes from the same individual fuse. Autogamy is comm…

T he  thoracic cavity has been opened to show the trachea , lungs (outlined with dashed yellow line) and heart (on the…

The soft palate is a structure that forms the back of the roof of the mouth. It is made of muscle and connective tiss…

The brain processes sound and associates it with emotions through a complex network of structures and pathways. When …

Plants transport water and minerals from their roots to their leaves through a vascular system composed of xylem and …

Biomolecules are organic molecules that are essential for life. Some examples of biomolecules and their functions are…