Having greater biodiversity in an ecosystem is beneficial to humans because A. Losing biodiversity in an ecosystem may negatively impact a plant we rely on for food
B. Places with high biodiversity, such as rainforests and coral reefs, are popular tourism destinations
C. We may discover new plants that can be used for medicine
D. All of these are correct.

the answer is a i think

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.