The tundra has trees, some grasses, large animals, and is usually cold. The desert on the other hand, Is usually hot, and has less animal and plant life. Deserts can be cold in some places though.
Answer:
Here's an explanation instead:
Explanation:
ALL STARS BEGIN IN A STELLAR NEBULA / NEBULA
Depending on how much mass the star has, it changes what path of life cycle it will take. Low mass or average mass stars become an average star, also called a main sequence star. It swells after millions of years into a Red Giant which is GIANT. Many many many years later, it becomes a planetary nebula, and finally becomes into a white dwarf.
If the star has a large mass, it is classified as a massive star, and also goes through a form of main sequence. It swells into a MASSIVE GIANT TREMENDIOUSLY LARGE AND UNNECCESSARILY BIGGO star called Red Supergiants. After millions and billions of years, it becomes a Supernova, which finally becomes a black hole if the outer layers literally get blown off into space and the core collapses and gets compacted into incredibly dense Nano-Googleplex sized molecules. If it doesn't, it becomes a cool Neutron Star.
I cannot drag tiles around, because there is no tiles or labels, however, I hope you get the point from this weird answer.
Answer:
D.) crossing over causes alleles of genes to be switched between homologous chromosomes.
