When did anton van leeuwenhoek invent the microscope

Awater molecule is polar because there is an uneven distribution of these between the oxygen and hydrogen atoms.

Nasa scientists must work together to make sure that everything is correct and accounted for when launching a shuttle. besides a physicist, what other type of scientist would be in making sure that the shuttle has the appropriate type and amount of fuel to reach its destination?

When mendel crossed a true-breeding short plant with a true-breeding tall plant all the offspring were tall. which term describes the gene for tallnes?