75km/hr due east
Explanation:
The velocity of the train will be 75km/hr due east.
- Velocity is given as the rate of change of displacement with time.
Velocity = 
- Velocity is a vector quantity that has both magnitude and directions.
- It is different from speed because it has the directional attribute.
- From the given data, we know that the train is moving at 75km per hour. This is the speed of the train.
- If we incorporate the direction then we have its velocity.
Learn more:
Velocity brainly.com/question/10962624
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Decaying tree would be considered a biotic as it is now dead, however it will form an ecosystem of bacteria, fungi and other saprotrophs.
In my point of view plasmids allow the genetic transfer of DNA so We can also genetically altered the plasmids to do what we want.
hope it helps
Mutation is the correct answer.
Try grassland, if that's an answer option :)