Science- Grade 8 Guide

What was the velocity (v= d/t) of vehicle 4 when it crashed into the guard rail

3.0 meters per second west

Commensalism

A relationship between two organisms in which one organism benefits and the other is unaffected

The scientist who conducted this study claimed that the results could be used to predict color variation in other mouse populations throughout Arizona. Which statement best explains why this claim is questionable?

Conclusions about mice at the study site may not accurately represent other populations in Arizona

*A recent study focused on the color variations of a certain species of mouse living in two neighboring habitats. Habitat 1 is a dark-colored, hardened lava bed, and habitat 2 is desert scrub with light-colored soil located at the edge of the lava bed. The graph shows the percent of dark-colored and light-colored mice captured in each habitat* Which hypothesis was most likely being tested in this investigation?

Individuals of a specifics living in different habitats have different colors of fur

If Jessica has light eyes (bb) and both of her parents have dark eyes (Bb) which statement is true?

Jessica inherited one recessive form of the genre from each parent

James placed a breath mint and a lump of toothpaste in a cup of water and let it sit overnight. Which statement best explains why the breath mint was gone the following morning, but the toothpaste was still at the bottom of the cup?

The breath mint was more soluble than the toothpaste

Which statement about the genetic traits of humans is true?

Visible traits depend on the dominant and recessive forms of genres from each parents

Some businesses offer customers the option to pay for merchandise using their fingerprints as identification. Which of the following would most benefit customers that us this new technology? a) cost of products is reduced b) protection of private information c) ability to track customer preferences d) funds would be credited immediately

b) protection of private

Which substance would most neutralize an acidic food?

baking soda (pH 8-9)

[Look at the velocity- time graph below] The acceleration of the object is ______.

increasing

Which environmental risk is not associated with the disposal of used motor oil from cars?

it dissolves in water and causes acid rain

Which of the following is a benefit of using radiation as a medical treatment?

it kills cancer cells

Which sentence about the periodic table of elements is true?

metals are found on the left side of the periodic table

After a basketball is thrown into the air, it will eventually fall back down to Earth. Which graph *best* demonstrates the relationship between time and distance from Earth as the basketball falls?

negative curve sloped

Paratism

one organism lives on or in another and harms it

Two of Ms.Barrett's students would like to design safer automobiles when they grow up. Which subject is least important for an automobile designer to study?

properties of rocks and minerals

mutulism

relationship in which both organisms benefit

Which pieces of equipment are needed to calculate the velocity of a falling objects?

tape measure and stopwatch

Which of the following is an example of organisms becoming dominant?

trees losing their leaves in the fall

During this experience, which action would most likely lead to a measurement error?

using different hand positions to release each object

The students were told that the net applied force from the engine was the same for each vehicle tested. Based on this information, which vehicle had the greatest acceleration (a= F/m)

vehicle 1

competitive

wanting to win or to be more successful than other people