A mold is a hollow area in rock in the shape of an organism or part of an organism. A mold forms when the hard part of an organism, such as a shell, is buried in sediment. … If the water deposits the minerals there, the result is
a cast
, a solid copy of the shape of an organism.
Which fossil is a solid copy?
| A B | What is a MOLD? A hollow impression left in sedimentary rock | What is a CAST ? A solid copy of an organism | What is a PETRIFIED fossil? Fossil in which minerals have replaced all or part of the organism. There may be parts of the organism preserved inside it. |
|---|
What is the shape of an organism called?
Morphology
, in biology, the study of the size, shape, and structure of animals, plants, and microorganisms and of the relationships of their constituent parts. The term refers to the general aspects of biological form and arrangement of the parts of a plant or an animal.
What is the remains of organisms in tar amber or ice?
Fossils found in rock include
petrified fossils
, molds and casts, carbon films, and trace fossils. Other fossils form when the remains of organisms are preserved in substances such as tar, amber, or ice. Petrified fossils are fossils in which minerals replace all or part of an organism.
What is a type of fossil that provides evidence of the activities of ancient organisms?
Trace fossils
provide evidence of the activities of ancient organisms. Fossil footprints, trails, and burrows are examples of trace fossils.
What shape do most cells have?
A description of the shape of a cell is called the cell morphology. The most common cell morphologies are
cocci (spherical) and bacilli (rods)
.
What is the best shape for a cell?
Therefore, if a cell is going to be spherical, it would be best to be
the smallest sphere possible
, because decreasing size increases the surface-to-volume ratio (i.e., the volume decreases faster than does the area that can service it with nutrients).
What is a fossil copy of an organism in a rock?
A copy of an organism preserved in the rock is called as
cast fossil
. Explanation: Cast fossils can be more like the mold fossils where an imprint is formed made in sediment or a rock.
Which organism has a better chance of leaving a fossil?
When an organism is buried quickly, there is less decay and the better the chance for it to be preserved. The hard parts of organisms,
such as bones, shells, and teeth
have a better chance of becoming fossils than do softer parts. One reason for this is that scavengers generally do not eat these parts.
What is no longer and never again existing as an organism on Earth?
Some have become
extinct
. A type of organism is extinct if it no longer exists and will never again live on Earth.
What is it called when something is stuck in amber?
Many
fossils
are of shells, bones, or teeth that have been turned to stone by a process called petrification. … Some fossilized animals were not turned to stone but simply preserved when they became trapped in amber, tar, peat, or ice.
What kind of animal is most likely to be preserved?
Animals with hard parts are more likely to be preserved than animals that have soft bodies.
Aquatic animals
are more likely to be preserved than terrestrial animals because water ecosystems have greater preservation potential.
What are called the remains of living organisms?
Fossils
are the remains of plants, animals, fungi, bacteria, and single-celled living things that have been replaced by rock material or impressions of organisms preserved in rock.
What method is used to provide accurate age and develop a record of rocks and fossils?
To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use
radiometric dating methods
, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
What is another name for a petrified fossil?
Petrified wood
(from the Latin root petro meaning ‘rock' or ‘stone'; literally ‘wood turned into stone') is the name given to a special type of fossilized remains of terrestrial vegetation.
What type of rocks are fossils found in?
Most fossils “hide out” in
sedimentary rock
. When tiny bits of rocks and minerals (called sediment) join together over millions of years, they become sedimentary rock. Plants and animals that become sandwiched in this sediment eventually turn into fossils. Two examples of sedimentary rocks are sandstone and shale.
