Answer:
A) Times of major climate change
Explanation:
The geological time scale is based on major changes in Earth's climate history. This is because of the reason that climate governs the geological processes on Earth. In geology, we study the ages with the help of stratigraphical data where sediment deposition and the fossils it is hosting are the keys to understand the environmental conditions at that particular time. These conditions didn't change significantly unless the climate was changed. An example is the extinction of dinosaurs during K/T boundary event (mass extinction). The most likely reason is the hitting of a meteorite on Earth that changed the climate of Earth in a short period making it least favorable for many organisms to survive.
On the other hand, the occurrence of huge events cannot be used to establish a geological time scale because sometimes, the changes happen more slowly.
Similarly, shifts in the Earth orbits are cyclic however geological time scale doesn't reflect cyclic changes. The same climate can establish in different ages but these events are not used not as a criterion to establish a geological time scale.
In the end, the time span of humans on Earth is very small when compared with the overall geological time scale. Humans record exists from Pleistocene (2,580,000 to 11,700 years ago) to today whereas geological time scale starts in the Archean Eon (4.0 billion to 2.5 billion years ago).
exExplanation: external internal
The encroaching urban areas could harm the wildlife around and in the everglades because of the fear of wildlife (people could shoot the animals) possible expansions could cause deforestation, and human pollution could kill off plants and animals.
Answer: CHIMPANZEES. RECKONED to be the most-intelligent animals on the planet, chimps can manipulate the environment and their surroundings to help themselves and their community. They can work out how to use things as tools to get things done faster, and they have outsmarted people many a time.
Explanation:
<u>Viruses </u>are microorganisms that are not included in phylogenetic trees because they are acellular.
Viruses can be described as the tiniest microorganisms that have the ability to replicate only using the host machinery. Scientists still have a debate on whether to consider viruses as living or non-living entities as they are unable to function as living organisms without a host.
Viruses also are not included in phylogenetic trees because they lack genes that are common to all species. They do not have proper cellular structures and are acellular due to which their addition to any phylogenetic tree is not possible. Any particular gene is not shared through a viral lineage, due to which creating a virus lineage is not possible.
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