Cha, Inc.: Nylon Life Cycle

In this biosphere worksheet, students identify the different levels of organization that ecologists study. Students complete charts, sentences, and answer short answer questions.

Studying mosses? Here is a great animation on the reproductive cycle of a moss.

A variety of questions are presented on the amazing amphibian. Life science intellectuals complete a life cycle diagram, describe characteristics and behaviors, and fill in a metamorphosis flowchart. Content level is geared toward middle...

This site from CHA, Inc. gives a biographical background of the Dupont's and gives information on one of its greatest discoveries, nylon.

This animation shows how the malaria life cycle is completed through mosquitos and humans.

Use this tutorial to enhance your understanding of how the human immunodeficiency virus invades healthy cells of the immune system. [3:15]

In this carbon cycle instructional activity, learners will read about the carbon cycle and study a diagram showing what creates carbon dioxide and what uses carbon dioxide. Students will then complete 4 short answer questions.

An opportunity for understanding the biology of the female reproductive system through animated presentations and test understanding with a quiz.

What exactly happens when you ovulate? This tutorial explains what happens including what hormones are released and when.

In this biology worksheet, 9th graders identify and explain what cell stay in inter-phase. Then they describe which stage of cell is the shortest and determine why that is true. Students also explain the process of mitosis.