Test 1

What was found in the rock layers between the Cretaceous and Paleogene Periods all around the

world providing evidence of a possible species extinction theory?

• plutonim

• uranium

• iridium

• iron

Which human body systems help with transporting oxygen and carbon dioxide?

• circulatory and respiratory

• digestive and endorcrine

• integumentary and skeletal

• endocrine and digestive

Which of the elements below can be used as a disinfectant?

• chlorine

• iodine

• bromine

• all of these

What is not a commonly listed advantage for recycling metal?

• conserves natural resources

• reduces landfill wastes

• emits more carbon dioxide to atmosphere

• uses less energy in processing

Propane fuel is commonly used in cooking and heating. What is its chemical formula?

• CO₂

• C₆H₁₂O₆

• C₆H₈O₇

• C₃H_8

Choose the best true or false answer for this statement. The type of material used in

making a guitar string affects the frequency and pitch of the sound made when it is plucked.

• True, the denser the material, the slower the string will vibrate

• False, the density of the material does not affect the sound

• False, the type of material only affects the tension

• True, the denser the material, the faster the string will vibrate

When a scientist gathers data during research through observation and experimentation this is

called what?

• a variance data

• controlled variables

• empirical data

• theoretical curves

Leucism, albinism, melanism, and xanthochroism have which of the following in common?

• all involve the study of invertebrates

• B. are characteristics of a specific turtle species

• color variations in organisms

• have nothing in common

During what stage of mitosis, do the chromatids (chromosomes) move to opposite poles of the

cell?

• anaphase

• prohase

• interphase

• metaphase

An atom or molecule that has an electric charge due to the loss or gain of one or more electrons

is called what?

• positive

• transient

• isotope

• ion