Answer:
The answer is: After step 3, layers of sediment cover the dead organism.
Explanation:
Fossilization is the process by which living things are preserved as impressions on sedimentary rock (fossils). This is a rare process that occurs under the most appropriate conditions.
Process of Fossilization:
Permineralization is one of the most common types of fossilization. It involves the absorption of minerals into the remains, giving a detailed impression of the dead organism.
- The dead organism sink to the bottom of the ocean.
- The soft parts i.e. the tissue is decomposed whereas the hard parts of the body: the nails, bones and hair remain.
- The bones are gradually covered by sediments. The quality of the fossils often depends upon the type and quantity of sediment. River deltas have a large amount of sediment. This speeds up the process. Clay and mud sediments provide more detail to the fossil whereas sandy sediments render the details vague.
- Sedimentation is followed by permineralization. As layers of sediment accumulate over each other, the layers underneath turn to rock. This occurs due to the movement of minerals down to the seabed that harden the sediments. Minerals such as calcite may even replace the bones and other hard parts of the fossil, allowing it to remain preserved for long.
- The fossils discovered by archaeologists are present relatively closer to the surface of the Earth. This occurs due to the uplifting of rock layers due to the movement of the continental plates.
Answer:
Changing temperature causes extinction or removal of organism from that place.
Explanation:
Small changes to both biotic and abiotic components can have major effects on an ecosystem because these are the factors on which the ecosystem depends. For example, if the temperature of the ecosystem increases from its limit, it makes the environment unfavourable for the organism so due to this change, the organism migrated to other location otherwise they will die due to unfavourable environment.
Answer:
D
Explanation:
Vacuoles are pockets that collect water and the cell's junk. The nucleus sends commands to other cell parts and contains DNA.
Why it isn't A: Both have membranes.
Vacuole- tonoplast. Nucleus- Nuclear membran.
Why it isn't B: The Vacuole is not a thick fluid, though it may <em>hold</em> thick fluid.
Why it isn't C: This should be obvious.
