In aphotic zones there is less than 1% sunlight since it is very deep in the ocean, most plants wouldn't be able to grow since they wouldn't have the resources.
It consists of two main parts. The peripheral and central. The central nervous system consists of the brain and spinal cord, while the peripheral has mainly nerves. The PNS has enclosed bundles of axons that connect to the brain as well as the rest of the body. Sorry, I'm a science nerd.but hope this helps buddy.
Answer:
Contracting muscle fibers do not always shorten.
Explanation:
Skeletal muscle fibers may be defined as the fiber that contain the single muscle cell that is cylindrical in nature. The connective tissue present in muscle is epimysium.
The contraction of the skeletal muscle fiber helps in the movement of the body. The contraction of the muscle fiber do not means that the muscle fiber gets shorten. The thick and thin filaments remains in their original length and the sarcomere shortens only.
Thus, the correct answer is option (C).
Answer:
Allele frequency can be described as a phenomenon which measure how common an allele is in a particular population. It tells about the genes which are richest in a gene pool and it also shows the genetic diversity in a population. Allele frequency is often expressed in percentages.
Natural selection tends to favour those organisms that are best adapted to live in an environment and which can withstand changes occurring in the ecosystem. If due to some circumstances, a trait becomes less useful to organisms in a population then by natural selection the allele frequency for those alleles will reduce with time. Similarly, the alleles which code for better genes for an environmental change will be increased due to the phenomenon of natural selection.
Osmosis is the movement of water where a high concentration of water moves to an area where there is a low concentration of water so that the concentrations are then equal. No energy is required for this.