What defines a mixture?

A.

can be broken down into its basic substances through physical means

B.

described by a chemical formula

C.

cannot be broken down into simpler substances

D.

created through a chemical reaction

How are marsh grasses adapted to the dry regions in Texas

Your mother asks you to carry a load of wood to the fireplace and lower it to the hearth. In doing this you have used your legs as levers. Which statement describes this as a class three lever? Question 13 options: A.

A true statement about the circulatory system is A. The pulmonary arteries carry oxygen-rich blood from the heart to the lungs B. The pulmonary veins carry oxygen-rich blood from the lungs to fed heart C.

13. Which one of the following diseases is caused by a virus? A. Tuberculosis B. Tetanus C. Hepatitis B D. Strep throat

Which phrase describes the absolute age of a rock? 1does not provide an exact age 2is the number of years since it formed 3is the age compared to other rocks around it 4indicates whether it is younger or older than the rocks above it

An important characteristic of animals is that all of their cells works the same way, they do not have any specialization. True or False?

When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods? A) latent periodB) fatigue periodC) relaxation periodD) refractory period

Evan and his friends are so surprised to find deer in their subdivision! His mom is getting mad because every morning they are in the garden eating everything they see.

HURRY! Which best describes the structure of the molecules that make up proteins? O A. Carbon + hydrogen + oxygen B. Phosphate + sugar ring + nucleotide base O C. Hemoglobin + oxygen + iron O D. Carboxyl group + amino group + side chain

Which plant cell organelle converts chemical fuel into packets of chemical energy that can power the cell?