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Just finshed it on a test. Sponges lack a digestive track, symmertical plan, and nerce cells.

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15y ago

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Why are sponges classified as an animal?

Sponges are classified as animals because they are multicellular, heterotrophic organisms that lack cell walls. They also have specialized cells and tissues, even though they lack complex organ systems.


What is a primitive life form such as mold or yeast that cannot make their own food?

A primitive life form like mold or yeast that cannot make their own food is referred to as a heterotroph. These organisms rely on external sources of organic matter for nutrition, as they lack the ability to produce their own through photosynthesis or chemosynthesis. Instead, they break down complex organic molecules into simpler forms that they can absorb and use for energy.


Why are sponges considered to be primitive animals?

Sponges were first though to be plants because, at first glance, they appear to be so. They are immobile, have no appendages to speak of, and lack a nervous and circulatory system. What sets them apart from plants, however, are two main things. The first being that they are filter feeders; they siphon water through their bodies and specialized cells with cillia catch the food and transport it to speceialized cells to be digested, whereas the vast majority of plants make their own food. The second is that most sponges start out as free-swimming larvae that eventually settle down onto a solid surface and transform into the sessile soft-bodied creatures we know as sponges.


How do sponges differ from other animals?

Sponges lack a true body cavity.Sponges exhibit radial symmetry.Sponges lack true tissues.Sponges are autotrophs.Sponges have a true coelom.-@leilooni


Necessary features are sponges or cnidarians lacking in order to have a more mobile lifestyle?

Sponges lack muscle cells for movement, while cnidarians lack a skeletal structure for support and protection. Without these features, these organisms are limited in their ability to achieve a more mobile lifestyle compared to animals with more specialized adaptations.


Do sea sponges make there own food?

No, sea sponges can not make their own food. They obtain their nutrition from the food particles in the water. Sponges primarily eat bacteria, phytoplankton, and other small food bits out of the water.


Living things that can NOT make their own food?

Sponges


How do you make a hole in foam sponges?

poke a hole in it


What do sponges make?

They make nothing,except growing arms when their arm break.


Why are sponges compressible?

sponges have a large amount of air spaces in between them. When we squeeze them, the air is expelled out & after releasing the pressure the air reenters helping it to regain its original shape. The presence of air spaces make sponges compressible.


How much deeper would the ocean be with no sponges?

It would make no difference


What happens to people who make sponges?

They die alone in little houses.