The flexible, longitudinal rod that is located between the digestive tract and the nerve cord in chordates is called the

A) spinal cord.
B) notochord.
C) dorsal, hollow nerve cord.
D) spine.


Answer: B

Biology & Microbiology

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An underwater volcano has erupted, and as the lava cools a new island has formed. Which types of animal species are likely to be among the first to colonize the island? (Check all that apply)  

_____  annelids _____  bats _____  birds _____  insects _____  snails _____  snakes _____  tapirs _____  tortoises Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about colonizing a new environment? What other information is related to the question?  Choose Answer:   Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?

Biology & Microbiology

The northern elephant seal, Mirounga angustirostris, suffered a significant population bottleneck in the late nineteenth century, when hunting reduced their population size to as few as 20 individuals

It has since rebounded to several tens of thousands. The related southern elephant seal, M. leonine, was not hunted as intensively. What prediction can you make about the relative levels of heterozygosity in populations of these two species?

Biology & Microbiology

When you look at a picture of a dog and then correctly identify it, what have you done in your conscious mind?

A) proprioception B) perception C) photoreception D) podsolization

Biology & Microbiology

Why does sour cream have a sharp, tart flavor

A) from the ADP produced by microbes during glycolysis B) from the lactic acid, produced anaerobically by microbes C) from the ethyl alcohol formed as the cream is broken down by microbes D) from the citric acid released by microbes during the citric acid cycle

Biology & Microbiology