As a consequence of your RAS bombarding your cerebral cortex, you feel sleepy
____________________ Indicate whether the statement is true or false.
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The famous Cambrian-era fossil deposit known as the Burgess Shale is now estimated to contain fossils of how many animal phyla?
A) None?animals had not appeared at the time. B) just two or three anatomically simple animal phyla C) about the same number as those alive today D) two or three times as many as alive today E) about half as many as are alive today
An embryo having a blastodisc exhibits holoblastic cleavage. Indicate whether the statement is true or false
Which of the following is a reason to question the sustainability of ethanol production from corn?
A. Gas mileage is better with ethanol than gasoline B. Only waste materials from corn production are used to make ethanol, so it doesn't compete with food production. C. Ethanol burns cleaner than gasoline. D. Farmers use a lot of fossil fuels to grow the corn used to make ethanol. E. Conventional agriculture uses less energy and increases the EROI of corn ethanol.
Which of the following processes is most likely responsible for many mammals having multiple hemoglobin genes?
a. a reciprocal translocation b. a duplication c. an inversion d. a deletion