Which of these was the dominant plant group at the time that dinosaurs were the dominant animals? (activity: highlights of plant phylogeny)
a) seedless vascular plants
b) charophyceans
c) gymnosperms
d) angiosperms
e) bryophytes

correct option is c) gymnosperm

Explanation:

During the time when dinosaurs were the predominant animal, Gymnosperms was the dominant group of plants

Gymnosperms were the predominant terrestrial plants throughout the dinosaur, cretaceous and Jurassic period. The living Coniferophyta, Cycadophyta and Ginkgophyta gymnosperms are identical in their woody habit and seed growth pattern but are not closely related.

correct option is c) gymnosperm

c) gymnosperms

Explanation:

Both gymnosperms and dinosaurs were dominant during Mesozoic.

-i take the course :)

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.