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).
Answer:
B. The mutations were beneficial for each new environment.
Explanation:
The dorsal side of the frog is the back of the frog, where the spine is.
Answer:
Burning fossil fuels spits out carbon dioxide into the air faster than photosynthesis and other processes can scrub it back out.
Explanation:
All food chains begin with producers
