Answer:
Cyanobacteria would be the first living thing on earth.
Explanation:
This would make sense because bacteria is always lurking somewhere even if it isn't in any organism. Bacteria can live in rocks or sand. So it would make sense that some type of bacteria would be the oldest thing.
Bacteria could be also one of the last living thing on earth as well.
If you have any questions feel free to ask in the comments - Mark
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Answer:
A congenital disorder is a medical condition that is present at or before birth. These conditions, also referred to as birth defects, can be acquired during the fetal stage of development or from the genetic make up of the parents.
Explanation:
The answer is a Vagus Nerve.
When a pathogen comes in contact with your body, it has to breach the first line of defense to get inside. Your skin and mucus membranes are the main barrier here. Mucus traps the pathogens, and then is forced out of your body when you cough or blow your nose. Your skin also secretes chemicals that have antiviral properties, killing viruses on contact. If the pathogens get through that defense, the next line is non-specific immunity cells that patrol your tissues engulfing pathogens. There are other cells that do this, like macrophages, but the dendritic cells are most important for activating the third line of defense in your body.
Dendritic cells reside in your tissues, waiting for an invader to arrive. When they do find one, they engulf it and digest it. After they do this, they select pieces of the invader called antigens and put them on their surfaces. The dendritic cells migrate back to lymph nodes, key locations in your body filled with immune cells. There, they show the antigens, called antigen presentation, to two types of lymphocytes, T-cells and B-cells, activating them for a full immune response.
