Organisms that can cause harm to even healthy individuals are known as:
Answer: Primary pathogens
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The release of ________ during a type I hypersensitivity reaction contributes to swelling
A) histamine B) prostaglandins C) leukotrienes D) both histamines and leukotrienes E) both proteases and prostaglandins
Alan Cooper, Cécile Mourer Chauviré, Geoffrey Chambers, Arndt von Haeseler, Allan Wilson and Svante Pääbo investigated the evolutionary relationships among some extinct and living species of flightless birds. They concluded that kiwis are more closely related to African and Australian flightless birds than they are to the moas. What new hypothesis did they propose based on this conclusion?
A. That flightless birds only occurred once in New Zealand. B. That New Zealand was colonized twice by ancestors of flightless birds. C. That the North American flightless bird originated from an ancestor of the New Zealand species. D. That their data was incorrect and the sample from the museum was corrupted. E. That the South American species' ancestors flew to New Zealand before the flightless mutation occurred.
In an experiment studying predator and prey relationships, a scientist offers a naïve toad a bumblebee as food. The bee stings the toad when the toad tries to catch and eat the bee. Subsequent feeding trials with the toad reveal that the toad avoids feeding on bumblebees. This is a demonstration of
A. non-associative learning on the toad's part. B. associative learning on the toad's part. C. ultimate learning on the toad's part. D. proximate learning on the toad's part. E. sign stimulus learning on the toad's part.
The stage that is least similar in all three groups is:
a. stage 1. c. stage 3. b. stage 2. d. stage 4.