A. The burning of large quantities of fossil fuels which take millions of years to replenish
I believe the answer to this question is D, I am not sure though.
I'm totally sure that the next step is A)Gametophyte. As it's the most suitable from given above.
This would be a covalent bond :)
I think its C. hormones act on muscles and glands only. Because hormones act on cells, tissues, organs etc. So this is incorrect and the rest of them are correct.
