The beginnings of a brain first become apparent around four weeks after conception when the neural plate folds to form the neural tube
Mechanical digestion is the breaking down of food into smaller pieces physically. Mechanical digestion begins in the mouth as the food is chewed.
but in the case of chemical digestion, it breaks the food into simpler nutrients that can be used by the cells. Chemical digestion begins in the mouth when food mixes with saliva.
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The outermost layer of the pleural membrane is the parietal pleura
Seeds have cotyledons from where they can draw their nutrient in their early stages of development. Pollens must draw their nutrient from their environment from the start.
Seeds have an outer coating (testa) that protects the embryo and enable it to remain dormant in the soil until right conditions for growth set forth
Seeds have a fully developed embryo that can begin to grow immediately there are right conditions. However, pollen has a single cell instead of an embryo, which must undertake cell division and specialization before beginning to germinate
Prophase 1
metaphase 1
anaphase 1
telophase and cytokinesis
prophase 2
metaphase 2
anaphase 2
telophase 2 and cytokinesis
