Biology Review of the Ozone Hole and Global Warming

Overview Human activity has affected the biosphere on Earth as the population has grown to over 7 billion. Some of the most troubling effects include changes to the ozone layer and global warming. The Stratosphere The stratosphere in Earth’s atmosphere is between 10 and 50 km above the surface. It has an inverted temperature, so […]

English Review: Modifiers

Overview Modifiers are words, such as adjectives or adverbs, or phrases, such as prepositional phrases, that add description to other words in a sentence.  Check to see if they are used in the correct form and location when editing an essay. Adverb or Adjective? Adverbs and adjectives are similar modifying words that take different forms […]

English Review: Verbs

Overview Verbs carry the action in sentences. Sometimes, however, it is difficult to choose the correct form of the verb to use when number, order, and tense are in question. Some strategies for correcting verb forms include editing phrases temporarily, rewriting questions, checking indefinite pronouns, and noting verb tenses. Cross out Prepositional Phrases Prepositions are […]

Math Review of Compound Inequalities

Overview Compound inequalities are similar to compound statements, as they are two simple inequalities joined by conjunctions. Suppose it were true that a variable x was between 2 and 9. A sentence would be written combining the statements “x is greater than 2” AND “x is less than 9.” Compound Statements Compound statements are common […]

Math Review of Inequalities with More than One Step

Overview If an inequality contains more than one operation, it will take more than one step to solve it. Suppose that in order to solve an inequality, both multiplication and addition statements need to be undone by using the multiplicative and additive inverses. As with other inequalities that take one step, the variable will have […]

Biology Review of Cones and Flowers

Overview Plants that reproduce by seed include cone-bearing plants and flowering plants. They can live in many different environments, because seeds store food separately for the plant embryo, to be used when the plant has the right conditions to sprout. Formation of Seeds Seed structure is similar for both cone-bearing plants and flowering plants. The […]

Biology Review of Biodiversity

Overview Biologists refer to “biodiversity” as the different types of organisms that exist in an ecosystem, species, or variety of genetic information. Many different types of plants, animals, and protists are essential to a healthy environment. Biodiversity is threatened by activities that lead to species endangerment or extinction. Alterations to Habitat If the habitat of […]

English Review: Problems with Pronouns

Overview Pronouns often cause trouble, and incorrect pronouns can be caught and corrected when editing an essay. They may be part of a compound subject or object. The pronoun reference may be unclear, or ambiguous. The pronoun used may be singular when the subject is plural, or vice versa. Although pronouns might be difficult, they […]

English Review: Sentence Fragments and Run-Ons

Overview Some of the errors to watch for when editing an essay include sentence fragments and run-on sentences. Sentence fragments are phrases that may have subjects but lack verbs. Run-on sentences go on and on and on, and they may need to be separated into two or three separate sentences. Sentence Fragments A sentence fragment […]

Math Review of Inequalities

Overview While equations are statements that two quantities are equal, inequalities state that quantities are not equal. One side of the expression might be greater than the other side, or one side of the expression may be less. Correct solutions for variables encompass more than one number. Inequalities Inequalities include symbols such as greater than […]