PRO: Quadrats work well for observing changes to whole populations over time, including distribution patterns, nesting and overall health. Some study techniques do not work with quadrats, however. For example, capture-recapture techniques that allow researchers to study individual animals do not work with quadrats because even slow-moving animals can move out of the study boundaries between sample periods.
CON: Despite the relative ease of designing quadrat studies, it is possible to introduce errors into a project. Quadrats that are too large, too small or spaced inappropriately often result in errors. For example, larger species require larger plots. Randomly spaced quadrats that are too small might miss too many individuals, resulting in under-representative estimates of population size.
<span>B. Bacillus
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Bacteria are single celled microorganisms. They have a simple cell structure than other organisms because they have no nucleus and no cell membrane. Their control center containing the genetic information si contained in a single loop of DNA. They are classified into five groups according to their shape; cocci are spherical, bacilli are rod shaped, spirilla are spiral, vibrios are comma and spirochaetes are corkscrew. They can exist as singe cells in pairs, chains or clusters. Rod shaped bacteria are called bacilli.
Answer:
a. Some microorganisms can cause disease.
Barium is Ba and has81 neutrons