B. The population is evolving. Changes in allele frequencies represent the evolution of a species.
The answer is - Never.
40 degrees of latitude, be it on the southern or northern part of the Earth, never gets direct sunlight throughout the year. This is due to the fact that the Earth's inclination is not that big so that the sunlight can fall directly on this latitude, in fact, the inclination of the Earth allows the sunlight to fall directly on the surface only to the lines of 23.5 degrees north and south of the Equator.
Answer:
2 electrons,
Explanation:
In an atom, the electrons spin around the center, also called the nucleus. The electrons like to be in separate shells/orbitals. Shell number one can only hold 2 electrons, shell two can hold 8, and for the first eighteen elements shell three can hold a maximum of eight electrons.
Answer:
Small vessels that carry blood away from the heart to the capillaries are <u>Arterioles</u>. Muscular-walled vessels that carry blood away from the heart are <u>Arteries</u>. One-cell-thick microscopic vessels that function to exchange nutrients and wastes are <u>Capillaries</u>. Small vessels that connect to the capillaries that carry blood back to the heart are <u>Venules</u>. Vessels that carry blood back to the heart are <u>Veins</u>.
Explanation:
We have different types of vessels in our bodies. We can divide them by their size and structure. Starting from the ones that carry blood away from the heath, we have the arteries. Arteries are vessels of big diameter that have muscle around them. Then, the arteries branch into arterioles, which have a smaller diameter. The arterioles branch into capillaries. These are small vessels with thin walls that allow the exchange of nutrients, wastes, and gases with the neighboring tissues. Once that the blood flows through the capillaries, it goes to the venules, which are small veins that will carry the blood to the veins and these to the heart. The veins do not have muscles in their structures, and their walls are thinner than the ones in the arteries.
A chondroblast will produce the fibers and ground substance for cartilage