When an engine is ignited, it produces thrust and boosts the rocket into the sky. After the propellant is used up, delay is activated, producing tracking smoke and allowing the rocket a brief coast.
infirmary (plural infirmaries) 1  A place where sick or injured people are cared for, especially a small hospital; sickhouse. 2  A clinic or dispensary within another institution.
An antibody, also known as an immunoglobulin, is a protein found in the blood or body fluid of an animal.These proteins have special receptors that allow them to bind to foreign substances known as antigens.Their purpose is to identify and neutralize antigens so that they cannot make the host organism sick.n antibody, also known as an immunoglobulin, is a protein found in the blood or body fluid of an animal.