Researchers looking for fossils of the earliest life forms face many hurdles. For example, few sedimentary rocks date back more than 3 billion years. Recall what you learned about plate tectonics. Explain why so few remaining samples of these early rocks remain.

Q: A paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive…

A: Earlier, paleontologists were only able to understand biological succession, they weren't aware of…

Q: 4. Fill in the table: Step of how life started 1- evolution of monomers 2- evolution of polymers…

A: The flow of genetic information in a biological system is explained by central dogma and it involves…

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: The period of the history of the earth that is referred to as Chemical Evolution was essential for…

A: Chemical evolution explains how life started on Earth. Chemical evolution refers to changes in…

Q: Which bits of evidence would convince you that life originated as early as 3.2 bya? a. You look at…

A: The change in the heritable characteristics of the species across many generations is called…

Q: The following statements concern organisms called stromatolites.  Which statements are true and…

A: (With accordance to the guidelines given to us, we are giving you detailed answer of 1st question.…

Q: A stromatolite is a form of sedimentary rock created by single-celled cyanobacteria (blue-green…

A: 1) (a) photosynthesis: photosynthesis occurs in plants on ancient earth as well as on present day…

Q: 1. Intro Why Classify? TO study the diversity of life, biologists use a classification system to…

A: Taxonomy deals with the identification and classification of organisms.

Q: what is a mold? A. the imprints from an organism can be a shell or the skin of an animal B. Molds…

A: Fossils are the preserved remains of the organisms that die. The palentologists deal with two basic…

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: Describe Louis Pasteur's work and why it was important 3

A: Louis Pasteur was a french scientist who disproved the theory of spontaneous generation by his…

Q: 4. You are looking at a series of rock layers and you want to survey the youngest stratum. How will…

A: Evolutionary developmental biology is considered a new norm in evolutionary biology. It arose from…

Q: A. Crossword on Earth's Record of Life Directions: Use the clues to answer the crossword puzzle. The…

A: Geologic Time Scale:- A record of the life forms and geologic events in. Earth's history. Scientists…

Q: A sample of bacteria is collected from soil in a field that was recently treated with pesticides.…

A: A pesticide is any substance that is used to kill, repel or control pests in plants or animals.…

Q: 9. Which of the following groups of organisms are considered likely to have been the first living…

A: Question - Which of the following groups of organisms are considered likely to have been the first…

Q: 2. Why is PCR useful?

A: Option d is the correct answer, that is V, I, II, IV, III. Explaination- First eukaryotes- App.…

Q: 9) Rocks containing fossil evidence have been found in Canada suggesting how life on Earth evolved.…

A: They are the remains of an organism that are preserved. They can be found as traces of ancient…

Q: 19. When a radio-isotope in a fossil with a half-life of 3,000 years has been reduced to 1/8th of…

A: On completion of each half life  the  amount of the substance reduces to half of its initial value.…

Q: 1.  Compare the different stuctures on the photo. 2. What do scientist infer from the similarities…

A: Homologous structures These structures have similar anatomy but perform different functions. These…

Q: Martian meteorites found in Antarctica were determined to possibly contain life. Scientists looked…

A: Known as ALH 84001, the Martian rock whose remains were present in meteorites contained structures…

Q: The first single-celled organisms on Earth probably evolved (a) 3,700 years ago (b) 3.7 million years…

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

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: 1. The woolly mammoth lived from the Pliocene to the Holocene time period. Compare the temperature…

A: Answer: TEMPERATURE: It is the measure of the level of heatness and coldness.  It  can be measured…

Q: Which of the following is an accurate point that supports the idea that the earliest protocells…

A: DNA and RNA are the genetic material present in the cell.

Q: Which of the following is thought to be the most closely related to the common animal ancestor? a.…

A: All living organisms are classified based on their internal and external features. The science of…

Q: Fossils are remains of ancient organisms found in the rocks are categorized depending on their age.…

A: The remnants and evidence of ancient species are known as fossils. The preserved remnants or traces…

Q: 1. 3 domains a. ancient,oldest living forms known; able to live in extreme conditions b. Inventor of…

A: In Biology the discovery of cell is very important step that opens the idea of the structure of a…

Q: Researchers looking for fossils of the earliest life-forms face many hurdles. For example, few…

A: To explain: The reason why only few remaining samples of these early rocks still remain on the…

Q: Describe how the structure of a protein (such as hemoglobin) is related to DNA. In other words, what…

A: The function of a protein is determined by its shape. The shape of a protein is determined by its…

Q: 1. For how long has there been life on earth? 2. For what percentage of time has life existed on…

A: ​The geological time scale relates layers of rock (stratigraphy) and carbon dating to periods of…

Q: 2) ; Multiple Choice: We believe the beginnings of life on earth took place in the: a) air b) land…

A: Evolution deals with the study of origin of earth, origin of life on earth and relationships between…

Q: Match the forms of life below with the earliest (approximate) time that it existed. Note: the earth…

A:

Q: 1. Gradualism is the theory that the earth’s features are the result of long-term processes that…

A: In 1858, Charles Darwin and Alfred Russel Wallace released "the Origin of Species", which detailed…

Q: 7. Which of the following statements about early life on earth is incorrect? A) Earth was anoxic B)…

A: Early life on earth was different than today. The life forms used arsenic before using oxygen or…

Q: Researchers looking for fossils of the earliest life forms face many hurdles. For example, few…

A: Fossils  Fossils are the imprint or undecayed part of dead organism or some parts of dead organism…

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: Studying the decay of radioactive isotopes in dead organisms helps scientists to identify fossilized…

A: In the decay of radioactive isotopes after the death of an organism, there is radioactive…

Q: Which of the following statements about the fossil record is true?   a. The fossil record is a…

A: Here we will discuss which of the following statements about the fossil record is true. Let us find…

Q: The extra energy required for the evolution of the highly complex eukaryotic cell was possible…

A: A cell is composed of several cell organelles. Besides the nucleus, mitochondria and chloroplasts…

Q: Earth's Interior and Surface and Pangaea 1. What do Earth's continents have in common with a jigsaw…

A: Continental drift is the theory that the Earth's continents have shifted relative to each other over…

Q: Describe Redi’s work and why it was important.

A: According to bartleby guidelines, when multiple questions are posted we are allowed to answer the…

Q: _ 7. What is meant by the term fossil fuel? In order to obtain energy from these fuels, a technique…

A: The fossil fuel is an important source of energy production. It is produced from the geological…

Q: All living things are divided into three domains: bacteria, archaea, and eukarya. They have several…

A: Early earth is not rich with oxygen until photosynthetic bacteria arrived after that oxygen levels…

Q: A. Crossword on Earth's Record of Life Directions: Use the clues to answer the crossword puzzle. The…

A: Fossils are preserved remains of plants and animals whose bodies were buried in sediments. Fossils…

Q: 2. The Paleozoic Era extended over which of the following time periods in the fossil record? A. the…

A: The palaeozoic era extended over the age of fishes from 542 million years ago to 251 million years…

Q: 1. Which of the following events are possible sources of high levels of iridium in sediments? Write…

A: Elements are the atoms which are present in the atmosphere, there are different elements present.…

Q: Mammals are "higher" than bacteria, this view does not reflect the reality of evolution.

A: Phylogenetic Trees and RelatednessA phylogenetic tree graph shows the advancement of four reptile…