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Bilateral symmetry is said to have evolved in those ancestral forms which started moving on ocean floor. A crawling predator is expected to encounter food or its prey with the advancing end. So mouth developed at the anterior end. The sensory organs and coordinating brain also developed near mouth at the front end, enabling the animals to sense and recognize edible or non-edible organisms. This is expected to initiate the development of brain and head, a process known as cephalisation.
What else can I help you with?
What makes organisms motile?
An organism is motile if it has the power to move.
Which kingdoms are motile?
The animal kingdom is mainly composed of motile organisms, while most organisms in the plant kingdom are non-motile. Some protists and fungi can also exhibit motility.
Are protozoa motile?
air, water, and other organisms
What is the opposite of a sessile?
The opposite of sessile is motile. Motile organisms are able to move or change position on their own, as opposed to sessile organisms which are fixed in one place.
What are the main characteristices of organisms?
1-living 2-can breath 3-motile 1-living 2-can breath 3-motile
What are fungi motile or non-motile?
Fungi are non motile means they are not able to move.
How would a receding water line affect viewing of a motile organism and a non motile organism?
A receding water line would expose motile organisms, such as fish or crabs, allowing them to move to new areas or seek refuge as their habitat changes. In contrast, non-motile organisms, like sea anemones or barnacles, would remain in place, becoming more visible as the water recedes. This change in visibility could enhance predation risk for non-motile organisms, while motile organisms may have to adapt their behaviors or find new environments. Consequently, the dynamics of the ecosystem could shift as species interact differently with their altered surroundings.
Are eggs motile?
No, eggs are not motile. They are typically stationary and rely on external factors like water flow or other organisms for movement. In the context of reproduction, sperm are the motile gametes that swim towards the egg for fertilization to occur.
What are examples of motile?
staphylococcus,shigella
Can Some motile organisms produce growth on artificial media with a spreading edge?
Yes
Motile and sessile?
"Motile" refers to organisms that are capable of movement, such as animals and some single-celled organisms. "Sessile" refers to organisms that are fixed in one place and do not move, such as plants and some types of animals like sponges.
Is cuttlefish nekton?
Cuttlefish ARE nekton because they are aquatic, motile (self-propelled) living organisms.
