How have humans changed the atmosphere of the planet in the past 200 years?

In sexual reproducing animals once fertilization of the egg takes place, the exists as a single cell until cell division begins. a) egg b) larva c) sperm d) zygote

Which equation is used to calculate the magnetic force on a charge moving in a magnetic field

Sediment layers stop lateral spreading when: they encounter a barrier they encounter an opposing current they run out of additional sedimentary material