In this online interactive ESL learning exercise, students respond to 18 fill in the blank questions regarding the phrasing of questions. Students check their answers immediately.

In this interactive vocabulary worksheet, students read the description of educational subjects and select the subject which the sentence is describing. There are 10 questions to complete.

Show your class how engineers use graphs to understand large and complex systems. The resource provides the beginnings of graph theory by introducing the class to set theory, graphs, and degree distributions of a graph. 

Interactive resource provides a problem set in which you will work with the types of genetic and biochemical information used to unravel the inner workings of the lac operator-repressor regulation system. Correct answers are reinforced...

Interactive resource provides students with an opportunity to work through a problem set over nucleic acids. Correct answers are reinforced with a brief explanation. Incorrect answers are linked to tutorials to help solve the problem.

Take this interactive, multiple-choice quiz over cells and cell structure, then review your score and any missed questions at the end.

Take this interactive, multiple-choice quiz over biology concepts and the scientific method, then review your score and any missed questions at the end.

Take this interactive, multiple-choice quiz over the biochemical processes of life, then review your score and any missed questions at the end.

Answer five comprehension check questions about the nature of science in this interactive quiz.

Answer five comprehension check questions about cnidarians and sponges in this interactive quiz.

Take an interactive quiz over biochemistry and organic chemistry. After completing the quiz, check your score, and then revisit any incorrect question for further review.

Assess your understanding of cells and their function with this interactive multiple choice quiz. Immediate feedback is provided.

Find out what you know about population ecology by taking this interactive post test.

Find out what you know about community ecology by taking this interactive pretest.

See what you know about the dynamics of ecosystems by taking this interactive pretest.

This interactive diagram helps students memorize the parts of a light microscope.

Assess your understanding of the carbon cycle with this interactive multiple choice quiz. Immediate feedback is provided.

Assess your understanding of photosynthesis with this interactive multiple choice quiz. Immediate feedback is provided.

Take this interactive, multiple-choice quiz over concepts in ecology, then review your score and any missed questions at the end.

Take an interactive, multiple choice quiz over life science careers. After completing the quiz, check your score, and then revisit any incorrect question for further review.

Take this interactive, multiple-choice quiz over spiders, then review your score and any missed questions at the end.

Take this interactive, multiple-choice quiz over bats, then review your score and any missed questions at the end.

Take this interactive, multiple-choice quiz over different types of spiders, then review your score and any missed questions at the end.

Take this interactive, multiple-choice quiz over birds of prey, then review your score and any missed questions at the end.