Which characteristic is shared by both cnidarians and flatworms?

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#Question id: 4564

#Unit 11. Evolution and Behavior

Who would have proposed that the boundaries between each stratum mark the occurrence of different localized floods?

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#Question id: 16119

#Unit 7. System Physiology – Animal

Following statements are regarding to Shivering, which is the most potent mechanism for increasing heat production in the body. 

A. Cold environmental temperatures activate centers in the posterior hypothalamus during shivering, which then activate the α and γ motoneurons innervating skeletal muscle. 

B. Shivering involves skeletal muscle contracts rhythmically, generating heat and raising body temperature.

C. Shivering involves stimulation of Na+-K+ ATPase and raising body temperature.

D. Shivering involves stimulation of β receptors in brown fat, which increases metabolic rate and heat production.

Which of the following combination is correct?

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#Question id: 19097

#Unit 6. System Physiology – Plant

Erwinia is a pathogen that deploy__

a) Attacking Initial biotrophic phase and extensive plant tissue damage at later stages or even death

b) Intimate intracellular contact with plant cells and minimal plant cell damage

c) Releases pectic enzyme that dissolve the cell wall

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#Question id: 13216

#Unit 6. System Physiology – Plant

Which statements is INCORRECT about this figure?

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#Question id: 5080

#Unit 5. Developmental Biology

As cleavage continues during frog development, the size of the blastomeres: