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In general, it makes the angiosperms more efficient in pollination and, therefore, in producing seeds. Most angiosperms have perfect or bisexual flowers, that is, both the male and female reproductive organs are borne on the same flower while these are separated in the gymnosperms. In the conifers which are gymnosperms, thousands of pollen grains will be needed to pollinate one female. The pollens are carried by the wind and having one pollen land exactly on the stamen is quite an impossibility.
<span>Many angiosperms have colorful petals. This attracts the insects and birds. As they move from one flower to another, they deposit the pollens on the stigma of another flower. The nectar that angiospermous flowers produce and the aroma emitted play the same role.</span>
Aerobic respiration is a chemical process inside cells which uses oxygen for the production of energy in the form of ATP. The waste products are carbon dioxide (CO2) and water (H2O). Aerobic reaction takes place within the mitochondria (inner membrane) and it consists of few steps: link reaction, citric acid cycle (or Krebs cycle) and the electron transport chain.
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Any DNA, RNA, or protein sequences can be used to draw a phylogenetic tree. But DNA sequences are the most widely used.