Which of the following cell types are responsible for initiating a secondary immune response?

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#Question id: 16962

#Unit 11. Evolution and Behavior

Which statements is not true for Mega evolution?

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#Question id: 11221

#Unit 7. System Physiology – Animal

The heart rate of a vertebrate will decrease in response to the arrival of ________.

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#Question id: 12250

#Unit 10. Ecological Principles

Two islands, P and Q, are similar in habitat and other features. They are 100 and 200 km2 in size respectively, but have the same number of species. Which of the following statements can independently explain this observation?

(i)    P is closer to the mainland than Q

(ii)   P is further away from the mainland than Q

(iii)  P has higher speciation rates than Q

(iv) P has lower speciation rates than Q

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#Question id: 12563

#Unit 10. Ecological Principles

How does phosphorus normally enter ecosystems? 

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#Question id: 22970

#Unit 7. System Physiology – Animal

Estrogen play important role in bone remodeling by the stimulation of;