What proportion of food products sold on U.S. supermarket shelves contains some form of genetically engineered crop?
a. 20%
b. 30%
c. 50%
d. 60%
e. 70%
E
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A population growth rate of 1% means a population will double in 70 years (70/growth rate). China's growth rate is 0.65%, which means
A. its population of 1.3 billion will reach 2.6 billion by 2080. B. at the current rate, its population would double in 108 years. C. the population has already begun to decrease from its peak 1.31 billion. D. China needs to reconsider its one-child policy
Composite cones typically are associated with what type of plate tectonic feature?
A) mid-ocean ridge B) hot spot C) continental collision zone D) subduction zone
Complete the pathway for olfaction.
What will be an ideal response?
Which of these four numbered features on the surface or in a cave can be formed by the dissolution or collapse of limestone?
A. 1 and 3 B. 1 and 4 C. 1 and 2 D. 2 and 3 E. 3 and 4