The threshold for radiation illness is about
A. 1 rem
B. 100 rem
C. 500 rem
D. 2500 rem
Answer: B. 100 rem
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Earth's atmosphere is fully transparent only to visible and radio light
a. True b. False Indicate whether the statement is true or false
The unit of magnetic flux is the weber. 1 Wb equals
A. 1 V·m.
B. 1 V·s/A.
C. 
D. 
You would like to find the surface temperature of a star so you will need the star's _____________________ spectrum and use _____________ to find the temperature. Knowing the temperature, you can use _________________ to find the total energy the star radiates at its surface
Fill in the blank(s) with correct word
What is one piece of evidence that some organelles like mitochondria and chloroplasts within eukaryotes used to be independent prokaryotes that were incorporated into eukaryotic cells?
A) the DNA inside organelles is not made of the same four bases as the DNA in the host cells B) organelles float around independently inside eukaryotic cells C) prokaryotes are seen incorporating into cells today D) organelles are very similar to present-day bacteria, suggesting a common ancestor