What is the most likely explanation for the extinction of giant kangaroos in Australia?
a. glaciers
b. asteroids
c. hunting
d. giant squid
c. hunting
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Which of the following is not a regulatory mechanism used to control the tryptophan operon in Escherichia coli?
A. Attenuation B. Repression C. Catabolite repression D. All of the choices are correct.
Approximately ____ of Earth’s total primary production is supplied by the ocean’s primary producers
a. one fourth b. one third c. half d. three fourths e. all
What is the expected proportion of offspring with sickle-cell anemia if both partners are heterozygous for the sickle-cell anemia gene?
What will be an ideal response?
Why scientist has to carefully describe their methodology in articles?
A. To show how much they work. B. So no one could copy their ideas and repeat the protocol. C. To other scientist can verify their results or try the same protocol in other circumstances. D. To prove that their conclusion are related to the introduction.