Sorry if this is wrong but a closed circulatory system is blood that is contained inside blood vessels, circulating unidirectionally (in one direction) from the heart around the systemic circulatory route, then returning to the heart again.
Following fertilization, the single-celled zygote undergoes cleavage, where it is then divided into numerous tiny cells. After 3 to 4 days of fertilization, the cleavage produces a 16 celled embryonic stage known as morula, which is contained within the zona pellucida.
After about 4-5 days of fertilization, cleavage produces a sphere mass of cells known as blastomeres, which is covered by a layer known as trophoblast and has a fluid-filled cavity in the center, known as blastocoel. The blastomeres then migrate inward, changing position and undergoing rearrangements. This is known as gastrulation.
Gastrulation then causes the development of three germ layers: ectoderma, endoderma, and mesoderma. The interaction of cells and the rearrangement of tissues and organs occurs only after the formation of germ layers.
Aerobic Respiration
*Oxygen is present when this form of respiration takes places
*In this form of Respiration gases are exchanged
*it can be easily found in the cytoplasm and mitochondria
*glucose breaks down into carbon dioxide and water
*all higher organisms such as mammals have this type of respiration.
Anaerobic Respiration
*Oxygen absent
*Gases aren't exchanged
*found only in the cytoplasm
*Glucose breaks down into ethyl alcohol, carbon dioxide and energy
*bacteria and yeast use this type
Ventajas: El adolescente aprende a conocer su cuerpo y las reacciones que produce
Desventajas: Puede provocar un embarazo adolescente, transmitir enfermedades de transmisión sexual.
Vegetarians just don’t eat red meat for the most part, they may still eat fish and drink milk and eat cheese, but it’s up to them. Byproducts that might include animal stuff in processed foods are usually okay for vegetarians.
Vegan is more strict than vegetarians Vegans do not eat any type of animal products, so no meat, no dairy, no fish, no processed food with animal byproducts. Vegans who are more strict can be seen not wearing any animal products, like leather or wool, not having leather furniture, or taxidermy stuff, and not having products tested by animals (make up, etc).