An isotope is an atom of an element that varies in mass number due to variation in the number of:

A. atoms.

B. protons.

C. neutrons.

D. electrons.

As Darwin was developing his ideas about evolution, hr applied ideas from many fields, including geology, economics, and biology. Why was this approach important?

What living and non-living things have you observed in your schoolyard or local public park?

What are the main organs of the respiratory system?

Which type of burn injury is characterized by an entrance wound and an exit wound?

What is a lithospheric plate made of?

Which statement about the U. S. Clean Water Act is true?

The United States uses which source of energy to produce almost 40 percent of its electricity? A. solar B. water C. biomass D. wind E. coal

Which cell breaks down carbohydrates

What characteristic distinguishes the five groups of fungi?

A research colleague has provided you with a single cell to identify. briefly describe the steps you would take to determine which domain this cell would most likely belong to.