Which characteristics describe the troposphere? Select two options.

is the innermost layer

contains the ozone layer

has the highest air pressure

spans 12-50 km above Earth

is a good place for planes to fly

What does it take to be an living organism?

Which of the following is TRUE about the tree of life? a. Archaea are more closely related to Bacteria than they are to Eukarya b. There is no common ancestor of all life forms living today c.

Which textbook feature identifies and divides the text into sections? exercises overviews graphics headings?

For fuel to be useful, energy must be released A. as heat or light B. in a controlled way C. contimuously D. over a long period of time

Scientists think that introns?

What is the junction between a nerve cell and another cell called: axon, synapse, dendrite, none of the above

1. Synthesize Information How do you explain to the horse owner why this foal was born with OLWS while two previous foals were perfectly healthy? What would you tell the new parents of the baby girl about their prospects for having more children?

What organelle is the control center for the cell and holds the DNA

The primary structure of a protein refers to the sequence of amino acids that are linked together in a long chain. Which of the following common items would best represent the primary structure of a protein? O A.

How many chromosomes do humans have? how many copies in normal cells? How many pairs? How many copies in sex cells?