Calcium is a substance found in vitamins that people take to strengthen their bones and teeth. which plant has been used for a similar purpose? ferns horsetails liverworts club mosses

80 pts the type of cloud shown here may produce heavy rainfall. this type of cloud most likely occurs in an area of the sub-saharan that is a) often dry. b) often wet. c) very windy. d) usually cool.

The population of bacteria in a petri dish doubles every 40 seconds. the population of the bacteria is initially 400 organisms. what unit is most appropriate for the time at which the number of bacteria is 300? hour bacteria per hour second bacteria per second

Why do oceanic plates tend to subduction when colliding with a continental plate