“seasonal furnace maintenance is essential to make sure your furnace is running efficiently and safely. a furnace that is not running at peak performance can be deadly due to the production of toxic gas. name this toxic gas and describe its effect on a red blood cell.”

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.