Answer:
Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function. Unicellular organisms include bacteria, protists, and yeast.
Multicellular organisms are composed of more than one cell, with groups of cells differentiating to take on specialized functions. In humans, cells differentiate early in development to become nerve cells, skin cells, muscle cells, blood cells, and other types of cells. One can easily observe the differences in these cells under a microscope. Their structure is related to their function, meaning each type of cell takes on a particular form in order to best serve its purpose. Nerve cells have appendages called dendrites and axons that connect with other nerve cells to move muscles, send signals to glands, or register sensory stimuli. Outer skin cells form flattened stacks that protect the body from the environment. Muscle cells are slender fibers that bundle together for muscle contraction.
Explanation:
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Answer:germinal, embryonic, and fetal
Explanation:
Germinal Stage this is the conception stage when the egg get fertilised by the sperm which occurs in women's fallopian tubes. When the egg is fertilised it is then referred to as a zygote. A zygote will then travel to the uterus which may take a week to get there. In the uterus it's where the single felled zygote will start to multiply cells and grow. It start and last from 0 - 2 weeks.
Embryonic Stage
The multiple cells are known as the embryo. This begins at the third week in which the multiple cells start to actual form something that can now be referred to as a human and not just cells. This is the crucial stage for brain development.
This is where the signal cord also develops.
Fetal stage
When cells have actual be distinct such that it can be visible that this is a human , the embryo now will move to the next stage in which it becomes a fetus. This occurs at the ninth week and until the baby is born.
The development of body system and structure continues and get more established than it was in embroynic stage.
