In Literature, Subject is referred as a topic. The theme is the opinion expressed on the subject. So basically, both are entirely different. Hope this answers your question.
A union of two people that is recognized both legally/spiritually (under God if you're into religion).
The four human practices that may lead to harmful effects to the environment are listed:
Wrong way of disposing the garbage.
Pollution due to vehicles, industries etc.
Noise pollution
Unhygienic surroundings
The above points lead to harming the environment in a negative way and are all caused by humans. There is although another aspect to this which is that these are under the control of human beings and can be minimized if there is a will to do so.
For more information on harmful effects to the environment click here:brainly.com/question/13840139#SPJ9