Fossilized stromatolites(A) formed around deep-sea vents.(B) resemble structures formed by bacterial communities that are found today in some shallowmarine bays.(C) provide evidence that plants moved onto landin the company of fungi around 500 million years ago.(D) contain the first undisputed fossils of eukaryotes.

Q: The Cenozoic Era extended over which of the following time periods in the fossil record? A. the…

A: Answer : The Cenozoic Era extended over  time periods in the fossil record is :  a)  the Paleozoic…

Q: Scientists who study forms of marine life that lived more than200 million years ago usually obtain…

A: Scientists who study forms of marine life that lived more than 200 million years ago usually obtain…

Q: What was more important for the invasion of the land by vertebrates during the Paleozoic: becoming…

A: Vertebrates are those animals that are characterized by the presence of well distinguished backbone…

Q: what does the Cambrian “explosion” refer

A: The early phase of the Paleozoic era that started 541 million years ago and lasted up to 485.4…

Q: How did the researchers use the DNA of living sponges to make conclusions about events occurring…

A: Answer- Every organism in a particular species have 99 percent same DNA sequence. Even among…

Q: Researchers looking for fossils of the earliest life-forms face many hurdles. Explain why so few…

A: Fossils are the preserved remnants of ancient creatures or evidence of their remains. Fossils are…

Q: How did Paleozoic life diversify during the Ordovician, Silurian,Devonian, Carboniferous, and…

A: Evolution is the change in the characteristics of a species over several generations and relies on…

Q: Was there molecular oxygen in the earth's primitive atmosphere? How has that molecule become…

A: Oxygen is one of the most important molecules or elements for all living organisms. It is…

Q: Chronologically arrange the evolutionary events with 1 being the earliest and 6 the most recent.…

A: Chronological event describe the timing of event as it occurred in the event of time period.…

Q: Direct evidence of life on early Earth comes from fossils of microorganisms that lived 3.5 billion…

A: The earliest life structures we are aware of were minuscule organic entities (microorganisms) that…

Q: Both large forams and forms in the but many of foraminifera groups disappeared at the end of the…

A: Foraminifera These are single-celled organisms. They belong to the phylum of amoeboid protists. They…

Q: What is the “Cambrian explosion,” and why is it significant?

A: Cambrian period refers to the initial geological period of the Palaeozoic Era as well as Phanerozoic…

Q: What types of organisms flourished in the Cambrian?

A: Evolution is the process of slow and gradual change over a period of time. There are different…

Q: The Cambrian Explosion occurred approximately 542 million years ago. During the Cambrian, what…

A: Cambrian period refers to the initial geological period of the Palaeozoic Era as well as Phanerozoic…

Q: ''Cambrian Explosion'' What contributed to this explosion of life? What were Earth conditions like…

A: Cambrian explosion was the rapid and unparalleled rise of the organisms at the beginning of the…

Q: Describe the evolutionary significance of the Cambrian explosion.

A: Introduction  Cambrian explosion event was occurred nearly 541 million years ago during the Cambrian…

Q: The Cambrian explosion is a conundrum: how can the long prior history of the phyla, revealed by…

A: Evolution is change in the heritable qualities of natural populaces over progressive ages. These…

Q: Before the emergence of life of what gases was the earth's primitive atmosphere constituted?

A: the primitive atmosphere was reducing in nature it had little or no oxygen  it was rich in water…

Q: During what geologic period did life on Earth begin?

A: Evolution is the process of gradual changes occurring in the species over a period of time, when the…

Q: Why will the fossil record always be incomplete?

A: FOSSIL : Fossil record give the evidence for any particular species that lived in the past period of…

Q: What factors influenced the isotopic composition of oxygen in skeletons of marine organisms during…

A: The factors that influenced the isotopic composition of oxygen in the skeleton of marine organisms…

Q: 1. The first terrestrial vertebrates to evolve, with lungs, tetrapod limbs, and a three-chambered…

A: The geological time scale is divided into different era, periods and ephos. The evolution of…

Q: What kind of fossils were formed out of dinosaur remains and activities? Why do you say so? (Give…

A: Dinosaurs lived many million years ago and they turned into fossils when they are dead. Almost 99%…

Q: For about how many years of geological time have the dinosours existed on earth?? Did dinosours…

A: Geological time scale divided the prehistoric earth into four eras based on the the environmental…

Q: 5. The Mesozoic Era extended over which of the following time periods in the fossil record? A. the…

A: Answer - B. The age of reptiles", from 251 million years ago to 65 million years ago.

Q: Cambrian explosion occurred?

A:

Q: How would the appearance of protocells have represented a key step in the origin of life?

A: Introduction  Origin of life on earth can be traced back to 3.4 billion years ago and as we now know…

Q: Which of the following is not a hypothesis used to describe the sudden change in the diversity of…

A: The term "Cambrian explosion" refers to a time when bilaterally symmetrical (bilaterian) animal…

Q: The greatest mass extinction episode in the history of life occurred at what boundary? (a)…

A: Mass Extinction events can be defined as those events in which half or more than half of all…

Q: All of the following have been suggested as triggers for the Cambrian radiation of complex metazoans…

A: Metazoans are sponges with no digestive system, nervous system, or true tissues. They are sessile…

Q: Scientist have determined that the early Earth had no free oxygen anywhere. Briefly explain what…

A: Scientists suggest that the early atmosphere of the earth was very hot and had no ozone or free…

Q: but many of foraminifera forams and groups disappeared at the end of the Both large forms in the…

A: Foraminifera also known as forams for short are one celled protists having internal shells. These…

Q: Plant life first appeared on land during which of the following periods? a. Cambrian period b.…

A: The palaeozoic era was divided into six periods and these were as follows: Cambrian Ordovician…

Q: What caused the Cambrian explosion? Describe current hypotheses.

A: Cambrian explosion denotes the most significant event in the evolution or the history of life on…

Q: If Marine communities dominated during the Early Paleozoic, why move to land? What would an…

A: Paleozoic era was a major interval of geologic time that began 541 million years ago and ended about…

Q: How would you describe earth of millions year ago

A: It is believed that our planet Earth is about 4.54 billion years old.  About 3.5 billion years ago…

Q: Imagine an ancient sunlit estuary rich in clay deposits. Countless aggregations of organic molecules…

A: Several hypotheses have been made in relation to life's origins on Earth. In 1936, Alexander Oparin…

Q: 5. The Cenozoic Era extended over which of the following time periods in the fossil record? A. the…

A: Geological time scale is a representation which evaluates how the life originates and undergo…

Q: If you were to find 60-million-year-old fossils of a species of land plants on the east coast of the…

A: Fossils are the substances that are used to give us information about how animals and plants were…

Q: Which of the following is not a fossil?a. Dried-out animal bones in a layer of desert sandb. A patch…

A:

Q: The Cambrian Explosion occurred due to the widespread adoption of bilateral symmetry and the…

A: The Cambrian explosion is a very important event in the studies of evolution and adaptation. This…

Q: What was the “Cambrian explosion” and how might you explain it?

A: Introduction  Cambrian explosion event was occurred nearly 541 million years ago during the Cambrian…

Q: what geology was occuring aroung the cambrian explosion that may have contributed to this…

A: Cambrian explosion occured around 541 million years ago.Cambrian period started after second great…

Q: -How long is the time span between the appearance of free atmospheric oxygen and evidence of complex…

A: The fossil studies help in understanding the formation of life forms on the earth. The various time…

Q: Which of the following periods is the earliest during which animals may have appeared? a. Ordovician…

A: Extinction aids the evolution of life by making way for new species. The number of species going…

Q: 4. The first aquatic vertebrates to evolve, with a cranium and a vertebral column, but no jaws…

A: The evolution of fish began about 530 million years ago during the Cambrian explosion. It was during…

Prokaryotic evolution

The term evolution means the gradual change or a transformation from a simple or primitive state to a complex or advanced state. Prokaryotic evolution is a concept that involves the evolution of the form and function of most primitive organisms (prokaryotes) through several stages and changes to form diverse life as a part of organic evolution.