Answer:
C. A giant landmass that existed over 250 million years ago
Explanation:
Pangea was the Earth when the continents were mainly together and there was only one "continent".
This type of relationship is Mutualism.
Mutualism is a type of relationship in which two organisms of different species both benefits from the activity of the other. From the question given, both the frogs and the flowers benefits from the relationship. The flowers provide shelter for the frogs, as the frogs live in pools of water collected by the flowers while the flowers also obtain nutrients from the frog wastes. Therefore, the relationship between the two organisms is mutual.
The answer that best fits the blank is "RELIABLE, BUT NOT A VALID". Sir Francis Galton is a known anthropologist and eugenicist, and for him, skull size in relation to intelligence might be reliable, but this do not have any evidence to be considered valid.
The mitochondria is the powerhouse, or in a sense the brain of the cell. The plant would be unable to (a) carry out respiration