OBJECTIVE LIFE SCIENCE
EVOLUTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
because some living things are too small
|
|
|
because some living things are too big
|
|
|
because some are subject to catastrophism and others are not
|
|
|
because environmental conditions have to be just right to prevent decay
|
Detailed explanation-1: -For an organism to become a fossil, it must not decompose or be eaten. This can happen if the organism either lives within or is moved to a place where it can be buried and kept from decaying. When an organism is buried quickly, there is less decay and the better the chance for it to be preserved.
Detailed explanation-2: -Fossilization is rare. Most organisms decompose fairly quickly after they die. For an organism to be fossilized, the remains usually need to be covered by sediment soon after death. Sediment can include the sandy seafloor, lava, and even sticky tar.
Detailed explanation-3: -Fossilisation is so unlikely that scientists estimate that less one-tenth of 1% of all the animal species that have ever lived have become fossils.
Detailed explanation-4: -Fossils are more likely to be preserved in marine environments for example, where rapid burial by sediments is possible. Less favourable environments include rocky mountaintops where carcasses decay quickly or few sediments are being deposited to bury them.
Detailed explanation-5: -In general, cold, dry conditions are more conducive to fossil preservation than warm, moist conditions. Cold areas also tend to have fewer scavengers, insects and bacteria that would accelerate a dead creature’s breakdown.