Which of the following represents one of the theories for the sudden change in diversity called the Cambrian Explosion?

a. sudden extreme cooling of the Earth’s climate
b. asteroid impact
c. rising atmospheric oxygen levels
d. migration introduction of new diseases


c. rising atmospheric oxygen levels

Biology & Microbiology

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Reactive oxygen species are detoxified by a general category of molecules referred to as ____

Fill in the blank with the appropriate word.

Biology & Microbiology

What tissue conducts water through a plant?

A) phloem B) xylem C) meristematic tissue D) epidermal tissue

Biology & Microbiology

According to the "new" revised phylogeny based on genetic analyses, annelids are a member of the Lophotrochozoa and are most closely related to which of the following groups?

A) echinoderms B) molluscs C) cnidarians D) arthropods

Biology & Microbiology

In early 2014, West African countries began diagnosing and reporting cases of Ebola for the first time in their history. This is an example of a(n) (endemic/epidemic/sporadic) disease

What will be an ideal response?

Biology & Microbiology