Epiglottis is the flap of cartilage that covers the opening of the larynx
Excretion is the only effective way invertebrates fight disease. Because they don't have an immune system working daily, invertebrates only have the capacity to excrete and cleanse their body of harmful materials.
The study would most likely be a QUANTITATIVE RESEARCH STUDY.
A quantitative research study is one that involves numeric measurements. The numeric measurement in the question given above is the value of the blood pressure which the researcher has to measure in the course of the research.<span />
