How are mitosis and meiosis alike and different?

Each trait of a plant is determined a. an allele b. one gene c. a pair of genes d. one dominant gene

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?

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.