The extinction of the dinosaurs is believed to have been caused by ________
a. competition from mammals
b. a natural global cooling cycle
c. an asteroid impact
d. disease
c
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Alternative autotrophic routes to the Calvin cycle such as the reverse citric acid cycle and the hydroxypropionate pathway are unified in their requirement for
A) CO2. B) coenzyme A. C) NAD(P)H. D) organic compound(s) formed.
A student has been tasked to observe microorganisms present in pond water under a microscope and draw them. Given that E. coli., amoeba, paramecium, algae, yeast, and Streptococcus are some of the microorganisms present in the pond water, describe the methods the student can employ to accomplish this assignment.
What will be an ideal response?
The smallest branches of the respiratory tree are the:a
pharynx. b. tracheae. c. bronchial tubes. d. bronchioles. e. bronchi.
Crossing two pink snapdragons yields some seeds that produce red-flowering plants, some seeds that produce white-flowering plants and some seeds that produce pink-flowering plants. If this trait operates by incomplete dominance and the allele R
represents red flowers and the allele r represents white flowers, what genotype would a plant with pink flowers have for this trait? A) rr B) RrRr C) RR D) Rr