Most parts of the country have daylight savings. in fall we set our clocks back an hour. in spring we
turn our clocks forward an hour. why? what is the advantage? what is the disadvantage?

the earth is tilted and the sun goes down earlier some parts of the year

Explanation:

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.