Properly identifying each species.
Accurately recording his findings.
Not interfering with ecosystem while studying the birds.
<span>Stabilizing selection is at work in this case. This is the force that allows a population to gradually center on a mean value due to a presence of a non-extreme bodily trait. The more extreme examples of the trait lead to the organisms being selected out, and the trait that is the least conspicuous wins out in the long-run.</span>
<span>Respiration is the process that is utilized by all living cells in order to create energy. The process is usually carried out in the presence of oxygen (aerobic respiration) but can also take place in the absence of oxygen (anaerobic respiration). Therefore the answer in this case is false.</span><span />
The body systems that work together to protect the body from pathogens are the immune system and circulatory system.
<h3>What are body systems?</h3>
Body systems are groups of organs, tissues and cells that act to perform one or more specialized functions.
The immune system is an organ system that acts to protect the body against the entry of pathogenic organisms such as bacteria.
In conclusion, the body systems that work together to protect the body from pathogens are the immune system and circulatory system.
Learn more about the immune system here:
brainly.com/question/6612564
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