Biology

Get notes, worksheets, labs, and worked problems in general biology, AP biology, genetic, microbiology, and more.

Species Definition in Biology — Get the species definition and examples in biology. Learn why defining a species is difficult and important.

Species Definition and Examples in Biology Recently updated !

This entry was posted on January 24, 2023 by Anne Helmenstine (updated on January 30, 2023)

Why Animal Eyes Have Different Pupil Shapes - Cats Have Vertical Pupils — Learn why cats have vertical pupils and learn about the advantage and disadvantages of different animal eye pupil shapes.

Why Do Cats Have Vertical Pupils? Eye Pupil Shapes

This entry was posted on January 7, 2023 by Anne Helmenstine (updated on January 12, 2023)

Examples of Bacteria in Everyday Life — Get examples of bacteria in everyday life. Learn where they occur, their properties, and whether they cause infections.

Examples of Bacteria in Everyday Life

This entry was posted on December 8, 2022 by Anne Helmenstine (updated on December 14, 2022)

Normal Body Temperature — Learn what normal body temperature is in Fahrenheit and Celsius. See the range of normal temperatures, depending on age.

What Is Normal Body Temperature?

This entry was posted on October 30, 2022 by Anne Helmenstine (updated on January 18, 2023)

Gram Positive vs Gram Negative Bacteria — Learn about the difference between Gram positive and Gram negative bacteria, including why you need to be able to tell them apart.

Gram Positive vs Gram Negative Bacteria

This entry was posted on September 28, 2022 by Anne Helmenstine (updated on October 7, 2022)

Symbiosis Definition and Examples — Get the symbiosis definition and examples. Learn about the different types of symbiosis in ecology and biology.

Symbiosis Definition and Examples

This entry was posted on September 25, 2022 by Anne Helmenstine (updated on November 18, 2022)

Do We Use 100% of Our Brain or Only 10% — Learn what percentage of our brain we use and where the 10% myth got started. See why 100% isn't necessarily the right answer, either.

What Percentage of Our Brain Do We Use? 100%? 10%?

This entry was posted on September 13, 2022 by Anne Helmenstine (updated on September 29, 2022)

Parasitism Definition and Examples — Learn about parasitism in ecology. Get the definition and see examples of parasites and their host species.

Parasitism Definition and Examples

This entry was posted on August 30, 2022 by Anne Helmenstine (updated on September 25, 2022)

Venom vs Poison — Learn the difference between venom and poison. Get examples of venomous and poisonous organisms and their toxins.

Venom vs Poison – Difference Between Venomous and Poisonous

This entry was posted on July 26, 2022 by Anne Helmenstine (updated on August 3, 2022)