The most accurate way to think about genes is that they are...
What will be an ideal response?
set boundaries for our development
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A marble has a diameter of 2 cm. At what distance would the marble have an angular diameter of 1 arc second?
a. 4.1 cm b. 4.1 miles c. 4.1 m d. 4.1 ft e. 4.1 km
Single-Slit Diffraction: What principle is responsible for light spreading as it passes through a narrow slit?
A. refraction B. polarization C. diffraction D. dispersion
What makes us think that Mars must once have had an atmosphere that was warmer and had higher surface pressure?
A) The atmosphere is too cold and thin for liquid water today, yet we see evidence of flowing water in the past. B) We think it for purely theoretical reasons, based on calculations showing that the Sun has brightened with time. C) The presence of inactive volcanoes on Mars tells us that there must once have been a lot of outgassing, and hence a thicker atmosphere. D) The fact that parts of Mars have a lot of craters tell us that Mars must once have been much warmer.
After seven half-lives have elapsed, what fraction of the original amount has changed into another element?
a. 6/7 b. 13/14 c. 127/128 d. None of these