How many sets of 23 chromosomes are found in human sex cells (gametes)?

In which direction is the pacific plate moving in relation to the north american plate?

20 points and brainlist 1. london has suffered from terrible air pollution for at least seven centuries. why is the city so prone to its famous “london fog? ” what did london do to get rid of its air pollution? 2. why does air pollution cause problems in developing nations more than in developed ones?

The transport tubes for food coming down the plants are called?