Which of the following is NOT a chemical change?

Which of these conditions most likely produces an unstable isotope?

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by