Answer:so wrong of you some people ACTUALLY need the answer ... the answer is A
Explanation:
A or c. I thought technically it was selective breeding but i haven't done genetics in a while to know what it's actually called
The right answer is vein (it contains blood and has valves).
The infra-cardiac veins of small and medium caliber possess this system of fight against gravity. The valves consist of a dense connective tissue, surmounted by endothelial cells, corresponding to a fold of the intima. They allow blood circulation in the sense organ / heart but prevent venous reflux.
Fumigation is a method of pest control that completely fills an area with gaseous pesticides ,or fumigants, to suffocate or poison the pests within
