From 5 red and 6 yellow balls 6 balls are drawn without replacement .x shows number of red balls. then find probability distribution and mean and variance

Afish fossil is found in a rock. a foot bone and tooth are found in an older layer of the same rock. what can scientists learn from the rock? a) the area changed from land to water. b) the area changed from water to land. c) the area has always been land. d) the area was once an ocean.