Select all that apply. Tragically, the United States lost astronauts in accidents involving:

Challenger
Columbia
Apollo 11
Viking 11
Vostok 1

Explain why phospholipid molecules form a bilayer. (3 marks)

Compare and contrast cladistics and phylogeny. what are their advantages and disadvantages? which is the most useful in understanding how an organism developed into its current form? which concept most strongly supports your opinion about the origin of any given organism?

What is the following best defines climate?