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Which type of organism developed first A. Deuterostomes B. Vertebrates C. Chordates D. Sponges?
D.Sponges
How long ago did sponge first appear on earth?
Sponges are one of the earliest forms of multicellular life on Earth, with fossils dating back to over 600 million years ago during the Ediacaran period. This makes sponges one of the oldest living animal lineages on the planet.
When did the first multicellular organism appear?
Multicellular organisms first appeared during the Vendian period.
When did the phylum platyhelminthes appear on earth?
The phylum Platyhelminthes is believed to have appeared on Earth during the Ediacaran period, around 550 million years ago. They are one of the earliest known groups of multicellular organisms.
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.
What is the difference between freshwater and marine sponges. Why is there no terrestrial sponge?
Freshwater sponges are delicate in structure, growing as encrusting or branching masses. They usually appear greenish because of the algae that live on them. Freshwater sponges may attain a volume of more than 2,500 cubic centimeters (150 cubic inches). Marine sponges are natural bath sponges (with living cells removed) that we all are familiar with. They actually are the oldest and simplest animals that have been living on earth for millions of years. Marine sponges are filter-feeding animals because all adult sponges are sessile and can't move around benthic surface. Marine sponges have no true tissues or organs, just constructed with layers of cells even without nervous system. Marine sponges come in different but striking colors, bright red, purple, yellow, and brown, etc. These colors and some are toxic as well may help them defend from sponge eating invertebrates and some fishes. Some other small marine organisms, fishes, and microscopic organisms often call marine sponges their homes. There are no terrestrial sponges because they are filter feeders obtain from water particles.
Why do you confuse sponges with plants?
Sponges look like plants. They do not appear to move and they are firmly attached to their substrate as if by roots. Unless you follow a sponge's life cycle, and see that the young sponges are motile, swimming freely in the water, and observe that sponges are not photosynthetic, obtaining their food by filtering microscopic organisms from the water, you might be confused.
Approximately how many million years ago did the earliest amphibians appear?
The earliest amphibians appeared approximately 250 million years ago.
When did the earliest organisims appear on Earth?
Nobody really knows when the earliest organisms were on Earth. It was definitely more than a million years ago.
How do glass sponges reproduce?
Sponges reproduce by having sex with their mate [conjugation] and making baby sponge Eggs that will touch Rock and stay on there for a few weeks until they can move and get their flagellas. Glass sponge does not appear in The Index.
Where did the surname Groban originate?
Earliest records of the German surname of Groban appear in Mecklenburg.
On FarmVille no rare animals appear?
Your right... there is no such thing as "rare" animals.
