Which of the following diseases is a recessively inherited disorder? 1. Huntington's disease
II. Sickle-cell disease
III. Cystic fibrosis
IV. Tay-Sachs disease
OA.
A. Tand IV only
OB. II, III and IV only
OC. lll only
OD. Tonly
O E. II and III only

Elements and compounds are pure substances that cannot be broken down physically into a simpler substance. a physical change doesn’t break the bonds between atoms of a substance or form new ones. compounds can be broken down by a chemical change. a chemical change breaks chemical bonds and/or forms new ones between atoms of a substance. what simple substance would a compound break into? the basic elements that make it up! for example, if you passed a very strong electric current through water you’d break the chemical bonds in water and be left with oxygen and hydrogen. which of the following is an example of a chemical change? a separating water into different glasses b breaking frozen ice cubes with a hammer c running an electric current through water d boiling water to evaporate it on a stove

What are two ways that harvesting algae from the ocean may benefit human society? how might the harvest of algae negatively impact the ocean communities where that algae grows? how could this be prevented?

Which type of neuron stimulates muscles to contract?