Why is the claim of the discovery of microfossils controversial?
A) they are found in rocks from the Hadean Eon
B) it is not clear whether they are of biological or mineral origin
C) the rocks they are found in are probably contaminated by terrestrial bacteria
D) they are too small to be of biological origin
Question 2
The idea of dark matter arose to explain gravitational effects observed in galaxies and clusters of galaxies.
However, studies of the early universe (especially of the cosmic microwave background and of chemical abundances) also tell us something about dark matter. What do they tell us? A) They add further support to the idea that dark matter really exists and is made of non-ordinary (nonbaryonic) matter, such as WIMPs.
B) They do not support the conclusion that dark matter is the dominant form of matter in the universe.
C) They tell us that dark matter probably exists, but that it must be made of ordinary (baryonic) matter in the form of MACHOs.
D) They tell us that dark matter was produced during the era of nuclei.
Elastic fibres are made of elastin, one type of structural protein found in the ECM of animal cells
Photosynthetic thylakoid membranes and numerous gas vesicles found in a cell of the cyanobacterial g
The Dugong is an endangered species; the largest remaining population is found in Australian waters
Rocks are the most common geosphere materials, and can be fun, dangerous, beauti
Gender differences in activity preference are found across cultures, although the specific ...
Common Metamorphic Rocks