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➷ The endocrine system is an organ system that works to produce and secrete hormones. It works by producing and secreting hormones that serve many purposes in the human body. For example, the secretion of insulin helps to regulate the level of glucose in the blood.
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<span>The correct answer is Pheromone. This isn't only common to moths, but mostly to all animals. Animals release pheromones to attract each other and procreate to ensure that the species continues existing. Sugars and hormones are completely different things and are unrelated to sexual attraction in animals.</span>
The thing that would mostly make the results of the experiment invalid would be the students themselves. No one is built the same, and the exact same food can have very different effects on different people.
Answer:
Polar bears will go extinct by the end of the 21st century.
Explanation:
Polar bears live at the North Pole. Due to global warming, the ice at the poles is melting at an alarming rate. Soon there won't be any glaciers. Without the ice Polar bears will lose their home. The climate on Earth is becoming warmer day by day. So even if the Polar bears survive they will not be able to adapt to the warmer climate. Thus leading to their extinction.
<em>Please mark me as brainliest.</em>
