You're correct.
Just make the last one OO
It belongs to 100-999 SCI Code. So its Primary category. Because its all about the farm and geographical industry that focuses on land production, deformation and production in growing the status of our economy and provide the need of people.
The correct answer is co-adaptation.
Co-adaptation in biology refers to the procedure by which two or more species, phenotypic traits or genes go through adaptation as a group or pair. This takes place when two or more associating features go through natural selection together in response to the similar selective pressure or when selective pressures change one feature and simultaneously changes the interactive feature. These associating features are only beneficial when together, in certain cases resulting in increased interdependence.
I think the answer would be number 1: - Building stone structures for housing.
its much less dense than the mantle and oceanic crust,etc.