After 3 half lives how much of a radioactive substance will remain

1/16

1/4

1/2

1/8

The arrangement of atoms in a solid causes it to have a definite

John decided to move from agriculture to the manufacturing sector. He abandoned his farm and shifted to a city. After a few years, when John visited his farm, he found the land covered with goose grass.

What type of organism moves using cilia? A. Euglena viridis B. paramecium C. amoeba D. mold

Which is the correct pathway of air as it enters the body? A. nose, pharynx, bronchi, bronchial tubes, trachea, alveoli B. nose, bronchial tubes, pharynx, trachea, bronchi, alveoli C. nose, pharynx, bronchi, alveoli, bronchial tubes, trachea D.

The lecture you were listening to is over. the bell that rang in the hall signaled the end of class. you get up out of your seat, pick up your things, and walk out the classroom door.

Which sentences describe star clusters?

Which of the following is an advantage of nuclear energy over fossil fuels? A. Eliminates the need for mining. B. Uses a renewable energy source. C. Releases less CO2 waste products. D. Releases more CO2 waste products.

A cell with 46 chromosomes inside itsnucleus goes through one round of mitosis and cytokinesis. How manychromosomes are inside each of the two resulting nuclei?

The theory that explains how the earths surface is made up of moving rocky plates is called: A. Supercontinent B. Plate tectonics C. Sea floor spreading D. Continental drift

10. Which of the following is an emerging dis- ease that was unknown 50 years ago? a. malaria b. dengue fever C. Lyme disease d. schistosomiasis