Once a slide is prepared and placed onto the microscope, the magnification and focus need to be altered. Describe how to change the magnification and bring the image into focus using a light microscope like the one in the simulation.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.

the answer u all are looking for is 4000000000000000000000 million years.