The fossils that provide information on the formation of an oxygen-rich atmosphere are the stromatilites from the Precambrian era. These are layered and columnar fossils consisting mainly of cyanobacteria which were the original life form back then. These bacteria took in carbon dioxide and produced oxygen by photosynthesis as early as 2.5 billion years ago (the earth is about 4.5 billion yrs old).
Answer:
ATP is produced by the oxidative reactions in the cytoplasm and mitochondrion of the cell, where carbohydrates, proteins, and fats undergo a series of metabolic reactions collectively called cellular respiration.
Answer:
Phloem
Explanation:
Glucose molecules do leave the leave cells in to the phloem to be transferred to other parts of the plant.
A reduction in sea ice due to climate change has negatively affected the food abundance of Penguins.
Explanation:
- Sea ice is ocean water frozen blocks. Unfortunately, rather than most other areas, climate change impacts Antarctica.
- If the temperatures on the surface of air and water rise, the sea ice melts. This leads to many marine mammals and seabirds losing their habitat and food supply, including Adelie penguins.
- The biggest threat to the penguins stems from changes in the Antarctic sea-ice cover, that will affect its feeding and breeding.
<span>The Miller-Urey experiment was one that produced several things, such as hydrogen cyanide, amino acids, adenine (among other nucleotides), and urea. The experiment proved that (c.) it was possible to form organic molecules from inorganic molecules. This explains why organic molecules were produced.</span>
