Sponges are similar to other animals in that they are multicellular, heterotrophic, lack cell walls and produce sperm cells. Unlike other animals, they lack true tissues and organs, and have no body symmetry.
The shapes of their bodies are adapted for maximal efficiency of water
flow through the central cavity, where it deposits nutrients, and leaves
through a hole called the osculum. Many sponges have internal skeletons of spongin and/or spicules of calcium carbonate or silicon dioxide. All sponges are sessile
aquatic animals. Although there are freshwater species, the great
majority are marine (salt water) species, ranging from tidal zones to
depths exceeding 8,800 m (5.5 mi).
TT or Tt because even though the second letter is not dominant the first one is greater
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Consider, for example, “shot noise” in a digital camera. ... Defining Extrinsic versus Intrinsic Noise in Transcription ...
Answer:
-This/control
"To study this possibility, the scientist uses two groups of people who are over 75 years of age and have mild memory loss. The control group receives 100 pills that contain fish oil. The control group receives similar pills that don’t contain any active ingredients. These fake pills are called placebos."
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