The correct answer is option b. They receive instructions in their DNA.
The DNA (deoxyribonucleic acid) or the genes present in the cell guides the fate of the cells during the process of cellular differentiation in the embryonic life of the multicellular organism. The signaling molecule change the genetic expression changes, by which the cells are differentiated.
Answer: The cell membrane is a bilayer of lipids composed mainly of lipids and proteins.
Explanation: A cell is the functional unit of life. A cell is usually surrounded by the cell membrane. A cell is composed of different organelles such as the nucleus, mitochondria, ribosome, each also surrounded by a membrane and these organelles are suspended in the fluidy part of the cell know as the cytoplasm.
A cell membrane is a thin lining that surrounds the cell and encloses the cytoplasm. It is made up of two layers of lipids in which proteins are embedded. Cell membranes allow the selective passage of materials into and out of the cell.
P^2 (Earth years) = a^3 (astronomical units)
P = period
a = semi-major axis of elliptical orbit
"...
Kepler's third law of planetary motion is a mathematical relation between orbital periods and distances. It allows astronomers to measure masses of celestial objects. Johannes Kepler went to work for Tycho Brahe near the end of Tycho's life. When Tycho died, Kepler used Tycho's data to deduce three laws of planetary motion. Because Tycho's data were far more accurate than any previously collected data on planetary positions neither Ptolemy's nor Copernicus's models of the cosmos worked.
Seminal vesicles
prostate gland
<span>bulbourethral glands
</span>The male reproductive system is designed to make sperm or male gametes and is adapted to provide for the delivery of these gametes to the female to allow for fertilization. It consists of:1. Testes- produces sperm and the hormone testosterone2. Scrotum- pouch enclosing the testes keeping the sperm at an optimum temperature.3. Vas deferens- tube that carries sperm away from the testes.4. Prostate gland- adds lubricating and other fluids to the sperm.5. Urethra- tube through the penis carrying sperm to the outside of the body.<span>6. Penis- adaptation for internal fertilization of the female.</span>
