The Pacific white-sided dolphins are well adapted to live in their environment. Two adaptations of the dolphins are:
1. Perfect Swimmers: The Pacific white-sided dolphins are perfect swimmers and they swim extremely well. they are very fast swimmers.
2. Sleeping with half a mind: Dolphins do not sleep completely. Half of their minds are always awake and they are attentive even when sleeping. This helps them from drowning in water.
Answer:
C. At least five mass-extinction events have occurred during the last 500 million years.
Explanation:
- The history of mass extinct is related to the five mass extinctions that are caused over by the 350 million years n which many species have disappeared in there short geologic time.
- A massive extinction is caused in the Permian Triassic extinction event i.e about 250 mn years ago which on an estimate has killed 90% of the species.
- The Cretaceous–Paleogene extinction event that occurred over 66 million years ago is known to have wiped out the dinosaurs and many other species.
Crest - The highest part of a transverse wave. Trough - The lowest part of a transverse wave. Wavelength - The distance between one crest and the next in a transverse wave. Amplitude - The height from the resting position to the crest of the transverse wave.
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