The microbiota of Amerindians, populations of humans with no or limited contact with Westerners, still showed antibiotic-resistant genes present. This is likely because

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

the answer is "a.) well–developed vascular system."

explanation:

the electromagnetic energy from the sun arrives in the form of visible and invisible light.