This bicycle had two wheels of the same size. The alignment of the front wheel was fixed. There were no pedals, so the bike was propelled by pushing off with your feet and the bike was steered by leaning.
strider bike
cruiser
hobby horse
mountain bike
Answer:
The correct answer is - hobby horse.
Explanation:
The hobby horse is the ancestor of the modern cycle which was invented by Von Dorin in 1817. This was way different to the modern bicycles as hobby horse bicycle had the bicycle with two same size wheels and the front wheel was in fixed alignment and there was no pedal attach to any wheel and itis driven by propelling it by pushing off with feet of the driver
It was the starting of the new era of man drive vehicle which was name after the toys of a child, hobby horse. By adapting the changes time to time by various engineers/scientist it becomes modern
relate degree of dissociation to strength of acid and base
Why are lymph nodes considered secondary lymphoid tissue?
Lymph nodes produce white blood cells, but they do not use white blood cells to fight infection.
Lymph nodes use white blood cells to fight infection, but they do not produce white blood cells.
Lymph nodes are the second line of defense against infection.
Lymph nodes are produced by the primary lymphoid tissues.
Explanation:
they filter out pathogens they mantain the population of mature lymphocytesThe secondary lymphoid organs are the lymph nodes and spleen, which keep the number of mature lymphocytes in check and filter out infections, hence option B is correct.
What is secondary lymphoid tissue?The thymus, where T-lymphocytes develop, and red bone marrow, which produces blood and immune cells, are the two main lymphoid organs.
Lymphocytes are also stimulated in secondary lymphoid tissues. Peyer's patches, tonsils, spleen, lymph nodes, and mucosa-associated lymphoid tissue are among them (MALT).
Numerous lymphocytes, a kind of white blood cell, are found in lymph nodes. They produce substances that stimulate other immune system components and aid in the battle against the illness. This is the reason why when you have an infection, your lymph nodes expand.
Therefore, the lymphocytes in your lymph nodes grow if you have an infection, hence option B is correct.
Learn more about lymph nodes, here:
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