What is thought to be the correct sequence of these events, from earliest to most recent, in the evolution of life on Earth?

1.  origin of mitochondria

2.  origin of multicellular eukaryotes

3.  origin of chloroplasts

4.  origin of cyanobacteria

5.  origin of fungal-plant symbioses

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#Question id: 11582

#Unit 7. System Physiology – Animal

Following a stressful stimulus, the fight-or-flight response will cause ________.

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#Question id: 11127

#Unit 7. System Physiology – Animal

As the receptor potential rises higher above threshold, which of the following best characterizes the new frequency of action potentials?

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#Question id: 23751

#General Aptitude

Which one of the following is always associated with 'Justice'?

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#Question id: 1553

#Unit 4. Cell Communication and Cell Signaling

A protein antigen requires to be processed in order to make it

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#Question id: 18374

#Unit 12. Applied Biology

Polycyclic aromatic hydrocarbons in the environment are of concern because they are potential