The statement 'Exploring the relationship between the material in a rock sample and its hardness' correctly describes an experimental investigation (Option C).
<h3>What is an experimental investigation?</h3>
An experimental investigation is defined as a procedure used in the scientific method to test an explanation or hypothesis, which can be confirmed or rejected.
In conclusion, the statement 'Exploring the relationship between the material in a rock sample and its hardness' correctly describes an experimental investigation (Option C).
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Sea otters affected biodiversity because they control the
populations of sea urchins, which endanger kelp forests. Kelp
forests are important because they convert sunlight to living material, and
they also provide food and habitat to sea creatures. Kelp is important in
sustaining the diversity of ecosystems. Additionally, sea otters may also be accountable
for the large size of abalones in California.
N order for the immune system to protect the body against attack by foreign organisms, it must be able to distinguish between the body's own <span>proteins </span><span>(autoantigens) and proteins from foreign cells (foreign </span><span>antigens </span>). When the immune system turns against autoantigens, thus attacking its own tissues, the resulting condition is an autoimmune disease.<span>
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Answer:
- Physical and chemical barriers
- non-specific innate responses
- specific adaptive responses
<u>The differences are...</u>
The first barrier is the physical and chemical barrier. It is the first line of defense when in contact with outside sources, this can be through the skin, earwax, nose-hair, etc.
The second barrier, the non-specific innate response, is after these outside sources have somehow managed to pass through the first barrier. They come into contact with cells and enzymes that help to defeat them.
The third barrier, the specific adaptive response, is the body's way of dealing with pathogens that the body has encountered before. (B cells activate)
