Grade 8 Science EOG Review

Which is a biological indicator of water quality?

• diversity of insect lavae

• turbidity

• pH level

• salinity

About what percentage of the Earth's surface is covered with water?

• 30 percent

• 50 percent

• 70 percent

• 90 percent

Earth's air is made up of molecules of different gases are not joined chemically, which term best describes air?

• compound

• mixture

• pure substance

• element

Which term is used to describe all disease-causing microorganisms?

• bacteria

• pathogens

• parasites

• viruses

Measles is a caused by a virus. Which is the most effective way to keep measles from spreading?

• giving antiviral medicines to people who have measles

• having healthy people wash their hands often

• giving antibiotics to people who have measles

• vaccinating healthy people against measles

Which is not considered to be a living organism?

• fungus

• virus

• pathogen

• bacterium

Which term best describes an organism that lives in or on another organism?

• decomposer

• predator

• parasite

• consumer

Which provides the best evidence that sharks and dolphins are closely related?

• They have different anatomies

• They use different feeding methods

• They evolved at different times

• They live in different parts of the ocean

Which is least likely to show that species share a common ancestor?

• They have similar genetic sequences

• They have similar embryo development

• They have analogous body structure

• They have homologous body structure

Why is it important to conserve energy from renewable resources?

• Renewable energy resources cannot be replaced after they are used

• Using renewable resources causes more pollution than non renewable resources

• Renewable resources produce radioactive wastes

• Every kind of renewable resources have some disadvantages