3. the _ is the region within a dividing cell where chromatids and homologous
chromosomes align in both mitosis and meiosis.

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.