The correct answer is: Layer 1, layer 2, and layer 4 in all three regions.
The index fossils are fossils that are commonly used for identifying a geological period of time, and these fossils are also very wide spread, as well as having a rapid evolutionary trends.
By this picture, we can easily see that even though we have rock strata from different regions, the same layers contain the same fossil, and it is a fossil that also is rapidly evolving so has a minor change in each layer.
Answer:
A polar molecule simply means the charges are uneven throughout the molecule. Some parts are slightly negative (outside the oxygen), and some parts are slightly positive (outside the hydrogen atoms). A covalent bond happens when atoms share their electrons with each other. So, polar covalent just means that the atoms aren't sharing their electrons evenly, creating slight charges in the molecule. Water is polar covalent because the highly electronegative oxygen atom pulls electrons to it, making the region around the oxygen more negative than the areas around the two hydrogen atoms.
C pesticide runoff........................................................juust doing this cuz its short
Answer:
b. did not initially have a mutually beneficial relationship with their hosts, but later evolved one
Explanation:
Initially, the host cell engulfed bacteria as food material. It did not have a mutually beneficial relationship with it. However, many engulfed bacteria had several advantages which could also benefit the host cell. For example, some of them could synthesis food material by the process of photosynthesis. The host cell then formed symbiotic relationship with these bacteria. They survived inside the host cell and in return they also supplied the host with prepared food material. Eventually this paved the way for endosymbiosis and origin of many organelles like chloroplast and mitochondria.
Answer: A.) Scientists change the names of taxonomic groups to math current nomenclature.
Explanation: I just took the same quiz & that was right.
