There might be life on Europa because it has an atmosphere that contains oxygen just like the Earth” Is this a strong analogy argument, and can be made stronger

Approximately how long ago did homo sapen (humans) first  appear on Earth 2,000 years ago 5-7 million years ago 65 million years ago 150,000 - 200,000 years ago    Hominins developed their unique larger brains before acquiring the ability to move on two feet.  True  False   the production of atmospheric oxygen in Earth's environment started with photosynthesis by prokaryotes photosynthesis by multicellular eukaryotes photosynthesis by single celled algae photosynthesis by land plants   Homologous structures among animal provide evidence for evolution in that theses structure are all produced by the same gene different in different animals, but are modifications of the same basic structure similar in function, but of different basic structure all different structures within the same species

Presumably in the first billion years of the Earth’s existence, there were many chemical reactions occurring and some of these reactions formed large quantities of organic molecules that accumulated in the early oceans, lakes, etc. This is often referred to as the “primordial ooze” or “prebiotic soup.” The conditions of the early Earth changed so new organic molecules weren’t being made, however many of the molecules in the primordial ooze reacted together forming more complex molecules and even, after millions of years, primitive cells formed. For energy, these primitive cells could metabolize some of the remaining organic molecules and “eat” other cells. At some point millions of years later, photosynthetic bacteria developed, but note that these bacteria did not give off O2. Then more millions of years later, the Cyanobacteria (the Blue-Green Bacteria) evolved and these organisms could photosynthesize and they gave off O2.  a) With the above scenario in mind, discuss the…

Immanuel Kant suggested, in his Investigation of the Question Whether the Earth Has Undergone Any Change in Its Axial Rotation (1754), that, according to Newtonian physics, in the distant past: the Earth had a longer day than 365 hours, but a year equal to 365 of our modern 24-hour days the Earth had a shorter year than 365 of our modern 24-hour days, but a longer day than 24 hours the Earth had a shorter day than 24 hours, but a year equal to 365 of our modern 24-hour days the Earth had a longer day than 24 hours, but a longer year than 365 of our modern 24-hour days the Earth had a year equal to 365 of our modern 24-hour days, but a longer day than 24 hours