It was during the ________ period within the ________ era that chordates made their first appearance.
A. Ordovician, Paleozoic
B. Paleozoic, Cambrian
C. Cambrian, Paleozoic
D. Mesozoic, Cretaceous
Answer: C
You might also like to view...
Imagine a hypothetical population of elephants and rabbits in which both species remain at carrying capacity over many generations. Who would have more offspring that survive to be adults and reproduce during their lifetime, a mating pair of elephants or a mating pair of rabbits? Explain your answer.
What will be an ideal response?
A molecular biologist treats a 600-kb length of linear DNA with HindIII restriction endonuclease. Following gel electrophoresis, the biologist observes that there is only one band on the gel corresponding with the migration distance of the 200-kb molecular weight marker. Assuming that no procedural errors were made, what can be concluded from these results?
A. There were no HindIII recognition sequences present in the original DNA. B. Three HindIII recognition sequences were present in the original DNA. C. One HindIII recognition sequence was present in the original DNA. D. Two HindIII recognition sequences were present in the original DNA.
Which of the following human syndromes is a monosomy?
a. Turner syndrome b. Klinefelter syndrome c. Down syndrome d. Barr body syndrome
The _____________, a layer of the endometrium, is shed during each menstruation and is then regenerated by the ____________.
a -stratum functionalis; myometrium b -myometrium; perimetrium c -stratum functionalis; stratum basalis d -stratum basalis; stratum functionalis