Animated activity offers a simple look at meiosis and the production of gametes for reproduction. The stages are well animated and then students can put the gametes together to make baby dragons to illustrate how different they can be. Note that the sex chromosomes in this activity are based on those found in birds and are not reflective of the chromosomes that determine sex in mammals.

Learning about transcription and translation can be difficult but this animation helps make the processes less confusing. The animation is interactive and it also covers the overall importance of proteins.

Use butterflies, mice, or finches to illustrate how natural selection changes populations. Each group has a different interactive animation that illustrates the concept.

This is a site which links to specific techniques of proving including conditional statements, proof by contradiction, mathematical induction, parity arguments, and the pigeonhole principle. The site contains a link to various example proofs. Be sure to follow the link for proof discussions and exercises.

Use these eight multiple choice passages to practice summarizing the main idea of a paragraph.

In this activity, students choose the correct category to which details belong. Being able to categorize helps students to identify the difference between main ideas and details.

Self-checking interactive tutorial puts reading comprehension skills to work by asking learners to make inferences, predict what happens next, and identify the main ideas in a series of short reading passages. Related materials include several videos and a downloadable worksheet.

Part 2 of a series of interactive exercises concerning word roots and vocabulary skills. Site initially explains vocabulary and word roots, then allows students to complete interactive exercises.

In this video, a policeman discusses summarizing in everyday life: movies, fairy tales, events, etc. He says, no details - only the main idea. [1:25]

Watch a video [3:07] to learn the about prefixes and how they affect words.

This video explains how to use a thesaurus and what information it gives you. [3:09]

Practice your vocabulary skills by choosing the stronger synonym from a word bank to complete each sentence.

An editing/proofreading checklist is often helpful when you read your own work, or someone else's. This site helps you edit for capitalization, sentence fragments, verb tense, and punctuation. Included is a brief video about sentence fragments. W.9-10.5 Writing Process

Discover more about grammar and punctuation when you check out this comprehensive site. This site gives a tutorial on correct grammar usage.

Have you ever seen an item that you wanted on sale for 15% of its original price? Have you tried to figure out what the sale price would be? Using this interactive lesson from T.V. 411, you can learn to calculate discounts with percentages.

Test what you know about prefixes. Feedback is given when you answer questions correctly or incorrectly.

Self-scoring interactive lesson for improving skills in scanning informational texts and charts for keywords and specific details.

Interactive quizzes to help develop skill using suffixes in vocabulary. After a short introductory slide show, students are asked to identify the meaning of words in context that use similar suffixes. Next, students fill in the appropriate word to complete a sentence. After that, students match suffixes to complete words in context. Immediate feedback follows both correct and incorrect answers.

Series of interactive activities for practicing skills in summarizing information, in identifying main points and ideas, and in sorting lists into meaningful categories.

Interactive lesson and activities for learning to look critically at the persuasive techniques of advertisements promoting political candidates and products.