Carbon dioxide is removed from the atmosphere primarily through photosynthesis and enters the terrestrial and oceanic biospheres. Carbon dioxide also dissolves directly from the atmosphere into bodies of water (ocean, lakes, etc.), as well as dissolving in precipitation as raindrops fall through the atmosphere.
Commensalism because the birds is benefiting but the tree is not harmed
The greenhouse effect that keeps the thermal excursion to a minimum and grants a warm temperature
Type O-negative blood does not have any antigens (so yes, it lacks all 3). It is called the "universal donor" type because it is compatible with any blood type
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Over our lifetime, our DNA can undergo changes or mutations that result in differences in the DNA sequence and may affect the proteins that are made. Mutations can occur as a natural consequence of errors in DNA replication or as a result of exposure to environmental factors such as smoking, sunlight or radiation.
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