The exoskeleton is made of <span>chitin</span>
The large muscles, especially in their jaws helps to extend their tongue to catch, gather, and consume their prey (food).
Hope that helps! xD
If it is the first time that this pathogen comes into contact with the immune system, IgM antibodies are produced, which are the first type of antibodies produced against a certain microorganism.
Immunoglobulins are molecules that intervene in defense processes against microorganisms and infections.
- Each type of immunoglobulin is specific against a certain antigen, this is what allows an immunological memory to exist, which is obtained when coming into contact for the first time with a certain microorganism.
- IgM is the first immunoglobulin synthesized by the neonate by itself, and it is also the first to appear during the primary response, which lasts an average of three weeks and then disappears.
- In general, the production of IgM antibodies precedes that of IgG, the concentration of antibodies can be high, plateau for a few days and then decrease rapidly.
Therefore, we can conclude that when the immune system first comes into contact with an antigen, a primary response occurs; mediated by IgM antibodies.
Learn more about IgM antibodies here: brainly.com/question/13022267
<h3><u>Answer;</u></h3>
29 grams
<h3><u>Explanation;</u></h3>
At 20°C, a saturated solution of sodium nitrate (NaNO3) contains 86 grams of solute in 100 m of water.
This means the solubility of NaNO3 at 20°C is 86 g/100 ml of water
The solubility of NaNO3 at 50 °C is 115 grams of NaNO3/100 ml of water.
Therefore; to get the amount of sodium nitrate must be added to saturate the solution at 50°C;
We subtract the solubility at 20°C from the solubility at 50 °C
That is; 115 g/100 ml of water - 86 g/100 ml of water
<u> = 29 grams of NaNO3</u>
