In the DNA helix, which part of the nucleotide forms the sides of the ladder, the backbone? A. Pentose sugar and Nitrogen base B. Pentose sugar and Phosphate group C. Nitrogen base and Carboxylic acid D. Phosphate group and Carboxylic acid

Which type of environmental pollution would not be the direct result of the human use of fossil fuels? A) The expansion of landfills with too much garbage to recycle. B) The contamination of rivers and groundwater from automotive runoff.

What have scientists learned from studying seismic waves that travel through earths interior? A) Seafloor spreading is the result of earthquakes that can occur at quite a distance.

Over time, many homozygous black and white mice are eaten while the heterozygous gray ones survive and reproduce. What is this an example of?

Which of these is found in the dorsal body cavity? Oa liver Ob brain O a kidney Od heart O e none of the above

Which is a byproduct of using hydrogen fuel?

What are the 2 types of Alzheimer's disease

Which of these lists the components of a reflex arc in the correct sequence? Which of these lists the components of a reflex arc in the correct sequence?

4) What is the main factor that contributes to carbons versatility? a. It has an equal number of protons and neutrons b. Its outer shell electrons are evenly spaced c. It has a four electrons in its valence shell d. It is a very large molecule

What kingdom did the first organisms on Earth belong to?

Fried foods and sweets are good sources for: water 2) vitamin B 3) fats 4) protein