During which stage of meiosis do synapsis and crossing over occur?

Which phrases describe an extrusive rock? check all that apply. fine texture cooled slowly small crystal size found deep underground different, easily observed minerals

Suppose you are estimating the size of a blue crab population. what is the population size if the number marked in the first catch is 40, the total number in the second catch is 200, and the number marked in the second catch is 50?

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box