4. D
5. C
6.C
Hope this helps :)
The three ways of improving upon the quality of indigenous soap are :-
● Add virgin coconut oil which serves as a softener and betel leaf extract. ...
● Add activated charcoal black granules or powder to the soap, it removes maximum dirt from the skin.
● Adding a filler which will increase the shelf life of usage of the soap will also improve its quality
The sun, producers , consumers, decomposers
Causing a drastic alteration of the environment that makes it unsustainable for life to thrive in that ecosystem causing the animals to go extinct
B. Arteries have a thicker tunica media than veins
