Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?

1. Protostomes invade terrestrial environments.

2. Cambrian explosion occurs.

3. Deuterostomes invade terrestrial environments.

4. Vertebrates become top predators in the seas.

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#Question id: 7497

#Part-A Aptitude & General Biotechnology

How many seconds will a 375 m long train take to cross a man walking with a speed of 2 km/h in the direction of the moving train, if the speed of the train is 56 km/h?

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#Question id: 7498

#Part-A Aptitude & General Biotechnology

Two trains of length 250 m and 140 m are running on parallel lines in the same direction at 58 km/h and 32 km/h respectively. Find the time taken by the slower train to pass the driver of the faster one.

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#Question id: 7499

#Part-A Aptitude & General Biotechnology

Two trains, one from A to B and the other from B to A, start simultaneously. After theymeet, the trains reach their destinations after 4 h and 9 h respectively. The ration of their speeds is

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#Question id: 7500

#Part-A Aptitude & General Biotechnology

A man is standing on a railway bridge which is 180 m long. He finds that a train crosses the bridge in 20 seconds but himself in 8 seconds. Find the length of the train and its speed.

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#Question id: 7501

#Part-A Aptitude & General Biotechnology

A train 150 m long is running with a speed of 68 kmph. In what time will it pass a man who Is running at 8 kmph in the same direction in which the train is going?

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#Question id: 7502

#Part-A Aptitude & General Biotechnology

A train 220 m long is running with a speed of 59 kmph. In what time will it pass a man who is running at 7 kmph in the direction opposite to that in which the train is going?