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
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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.
What tissue conducts water through a plant?
A) phloem B) xylem C) meristematic tissue D) epidermal tissue
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
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?