The first three answers are natural changes, while the last three are because of human intervention.
Answer: The answer is B
Explanation: The ratio decreases from 1.6 to 1.2 because fewer stomata are needed at higher CO, concentrations
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Answer:
Germ cell tumors are generally located in the gonads but can also appear in the abdomen, pelvis, mediastinum, or brain. Germ cells migrating to the gonads may not reach that intended destination and a tumor can grow wherever they end up, but the exact cause is still unknown. These tumors can be benign or malignant.
Explanation:
Most insects have small holes in the exoskeleton called spiracles, which open and close to regulate the air flow. The holes lead to the trachea. The correct answer is C, spiracles.
<em> Tolerance ranges</em> – Different types of organisms have different tolerance ranges for the same factor. And in fact, the tolerance range of a single individual may change over time; individuals of a certain species of salmon, for example, start life in a freshwater stream, migrate out to the open ocean, and then come back to their home stream to reproduce.
<em>Geographic range-</em> Describes the spatial area where a species is found. Studies on the processes determining geographic range patterns address fundamental questions, which are very much at the heart of ecological research, on distribution and abundance of species. Geographic ranges are influenced by both abiotic and biotic factors.