How did the corn blight of the 1970s affect agriculture? Was that outcome useful in the long term
What will be an ideal response?
The corn blight exposed the dangers of reliance on just a single hybrid variety,
and planting that same variety year after year. As mentioned above, the development of seed
banks to help preserve genetic resources of precursor or related species and genetic
variation was much accelerated by that experience.
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Giant spirals are the largest galaxies in the Universe
a. True b. False Indicate whether the statement is true or false
The solar neutrino problem was solved when it was discovered that neutrinos ________ during the time they take to reach the Earth
Fill in the blank(s) with correct word
Ref. 59 finds that lead deposition decreases after 1979 . What could be the reason? Suggest a possible answer. Justify your suggestion
What will be an ideal response?
A 25-kg block on a horizontal surface is attached to a light spring (force constant = 8.0 kN/m). The block is pulled 10 cm to the right from its equilibrium position and released from rest. When the block has moved 2.0 cm toward its equilibrium position, its kinetic energy is 12 J. What is the change in mechanical energy caused by the frictional force on the block as it moves the 2.0 cm?
a. -4.0 J b. -3.5 J c. -2.4 J d. -2.9 J e. -15 J