When the atrioventricular valves open.
This is when Ventricles are being filled with blood from the atrium.
Answer: Lower lumbar
Explanation:
The spinal column is refered to as the vertebral column and it's the central axis of skeleton. It supports the trunk, provides attachments to muscles, and helps in the protection of the spinal cord.
The area of the spinal column that is subject to the greatest mechanical stress and degenerative changes is Lower lumbar.
The answer to your question is D) Zygote.
The answer is; true
These microbes are usually adapted to their environment and this is why they are found in virtually all ecosystems. You will find bacteria even at the bottom of deep ocean beds deep and in geothermal vents, hypersaline water and very cold regions (such as polar regions). Fungi which vary widely in size from microscopically small to the largest organisms such as mushrooms are also found in virtually all environments on earth. They are nonetheless different species of these groups adapted to their environments.
Answer:
the protein known as keratin, the main component of the epidermis. Melanocytes, which produce your skin pigment, known as melanin. Langerhans cells, which prevent things from getting into your skin.
