Which of the following theories as regards the origin of life on earth is accepted today? A. Theory of spontaneous generation B. Theory of special creation C. Cosmozoic theory D. Theory of abiogenesis
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- Place these events in the history of life on Earth in the order that they occurred. a. accumulation of O2 in Earth’s atmosphere b. colonization of land by plants and fungi c. diversification of animals (Cambrian explosion) d. origin of eukaryotes e. origin of humans f. origin of multicellular organisms g. origin of prokaryotesWhich of the following describes the organisms and/or processes that were most influential in the creation of early Earth ecosystems? a. Extinction of animals and domination of plants b. Build up the greenhouse gas carbon dioxide c. Prokaryotic production of an oxygen rich environment d. Eukaryotic growthWhich of the following was likely MOST important for life to begin existing on Earth? A. sunlight B. DNA C. a source of oxygen D. a source of energy
- Which of the following events occurred first in eukaryotic evolution? a. Endosymbiosis and mitochondria evolution b. Endosymbiosis and chloroplast evolution c. Compartmentalization and formation of the nucleus d. Formation of multicellular organismsA. How old is the Earth? B. How long did the longest eon (so far) last? C. How many years ago did the most recent epoch begin? D. How many mass extinction events has the Earth witnessed so far?Which of the following represent issues of great uncertainty regarding early Earth? Choose one or more: ✓ A. whether early life forms were thermophiles or psychrophiles B. whether first life was prokaryotic or eukaryotic C. whether life evolved here or was of extraplanetary origin D. whether first organisms were aerobes or anaerobes O E. role of methanogens and atmospheric methane
- Scientists think that terrestrial life probably originated in Earth's oceans becauseChoose one: A. energy was available there. B. all of the chemical pieces were there. C. All of the possible answers are correct. D. the earliest evidence for life on Earth comes in ocean-dwelling forms.Martian meteorites found in Antarctica were determined to possibly contain life. Scientists looked skeptically at these meteorites because a. their results suggest unusual chemical signatures that do not indicate life. b. features thought to be Martian fossils could be nonbiochemical formations. c. it is impossible for a piece of the Martian surface to fall to Earth. d. both a and b are true.where on the earth did life mostly likely first emerge, where all the ingredients and conditions for life existed? a. volcanic islands b. deep oceanic vents c. tidal pools d. tropical rainforest
- 1. Understanding geologic time is significant because it helps us a. Understand humans’ impact on our environment b. Understand the process of evolution c. Understand the possibility for life on other planets d. Understand the evolution of organisms over timeChoose the answer from the given concept below. A. Extraterrestial Origin B. Divine Creation C. Spontaneous Origin D. Big bang theory 1. this is the oldest among life's origin theories and the most accepted among others. It may vary vary on the practice of a religion, but it's commonality is that a Divine God created life. It is called the 2.Meteorite contains amino acids, nucleotide bases and sugar. Hundreds of thousands of meteorites and comets are known to have fallen into the early Earth, suggesting that it may contain some organic material. It is referred as the 3. Greek philosopher Aristotle proposed a theory eith the idea that living matter may arise from non-living matter. These are based on early observations such as the appearance of maggots in rotting meat, mice on corn and fish from mud of previously dry lakesThe fossil record shows that in just the last 600 million years, there have been five instances of sharp decreases in the diversity and abundance of living organisms. what are these events? a. droughts b. mass extinctions c. reversals of the earth's magnetic field d. great migration