What the purpose of the mucus found within the respiratory system is to

A. trap particles from the air before they reach the lung.

B. lubricate the epiglottis

c. is wrong

D. push the cilia away from the lungs

What is iodine solution changing from amber-yellow to blue-black an indication of? a. the presence of reducing sugars or monosaccharides b. the presence of proteins or peptide bonds c. the presence of lipids or fats d.

Which sentence describes the action of natural selection?

Breaking a rock into smaller pieces by natural causes is known as A. erosion. B. the rock cycle. C. chemical weathering. D. mechanical weathering.

The blood brain barrier is formed by: a. Oligodendrocytes b. ependyma cells c. schwann cells d. astrocytes e. none of above

What are rocks made up of

Which of these is not an organism? a) lungs b) bacteria c) mold d) human

Why might to elements proces why might to elements possess similar chemical properties?

What happens in the electric circuit when the magnet spins?

An enzyme used to covalently join dna segments to form recombinant dna molecules is called a

List the seven steps in the decision-making process.