Answer:
D. Fossils of the Cambrian Period
Explanation:
The Cambrian Period (541–485.4 million years) is the period known for the explosion of life on Earth, when all the major phyla of multicellular organisms originated, and almost all the groups we find today, in a period of time geologically short.
The primitive faunas of this period had numerous morphological patterns, an immense variety of species, mostly soft-bodied animals, and new ecological strategies such as predation, burying themselves deep in the sediment and building complex, branched tunnels. They also featured some relatively large skeletal animals, such as trilobites, brachiopods, and
Answer: They are directly caused by the gravitational pull of the Sun.
Explanation:
Water waves are caused by a whole number of factors, they include,
1.) Local winds
2.) Distant wind
3.) Air pressure
4.) Seismic sea wave
The gravitational pull of the sun and moon on the earth also causes waves. Although the sun's gravity also contributes to the waves, but its effects are smaller and serve mostly to vary the heights of high and low tide.
After reaching North America, humans migrated to South America.
