Anoxygenic photosynthetic bacteria: a. obtain electrons from water. b. produce oxygen as a by-product. c. may obtain electrons from H2S. d. are obligate aerobes.

relationships play a major role in a human's emotional and mental wellbeing. healthy relationships with the people around you are even linked to a smaller production of cortisol, a stress hormone.

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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.