What term describes a pure substance that is made up of only one type of atom?

matter, rock, compound or element?

Among human populations, the primary use of fresh water is for

All BUT one factor contributes to biological evolution. That is ... A) mitosis. B) mutation. C) crossing over. D) sexual reproduction.

Viruses are different from bacteria in that they can be found just about anywhere they can remain dormant on non-living surfaces they can infect just about every form of life

What are some of the causes of the carbon dioxide increase over the past 50 years

Each tip (sp 1-4) represents a different species of ant. Species 1 is the outgroup. Of species 3 and 4 possessed a Thymine a nucleotide position 45, while species 1, and 2 possessed an Adenine, then what kind of character is the A nucleotide at

The lowest level of environmental complexity that includes both living and nonliving factors is the A: Biome B: Community C: Ecosystem D: Biosphere

Which part of the endocrine system is located in the middle of the brain

Suppose a tropical storm hit your local coastal areas. Residents noticed a large amount of dead fish washed up on the beach following the storm. What physical factors of the aquatic ecosystem may have caused the fish die off?

A scientist describe to study the effect of salt on a particular type of bacteria. Arrange the steps Of the scientific method in the correct order to show how the scientist would proceed with his work

How is a new species or group of species represented in the scientist's model?