Hey,
our intuition about life is simply; it moves it eats and it reproduces.
But there is more to it than that.
When we get down to the microworld tiny organisms become less and less complicated and more like the natural world around them. So how uncomplex can it be before it isn't living? That is a hard question to answer.
scientists have a basic definiton or "check boxes" that somthing must fill before it is considered living. Here are some "check boxes";
move, respond to stimuli, reproduce and grow, respire(breathe), and are dependent on their environment.
If you have just 1 of these and you call it living it wouldn't work. For example you could say anything that grows is living. black holes grow. You may say that anything that reproduces is alive, well when a giant star explodes some of its gas collapses and forms other stars, so that is saying that a star is living.
Wbob1314
Answer:
Major threats to freshwater fishes and other freshwater biodiversity, include: habitat modification, fragmentation, and destruction; invasive species; overfishing; environmental pollution; forestry practise; and climate change.
Answer:
Mollusca Phylum
Gastropoda class
Explanation:
The Mollusca Phylum is one of the most noticeable phyla that includes a wide variety of forms.
The ancestral Mollusca used to habit the pre-cambric oceans. It was bilaterally symmetrical, with a well-defined head that had tentacles and ocellus. Its ventral surface was plane and muscular, shaping a reptant foot. The dorsal surface was protected with a convex and oval shell.
The Gastropoda class is the richest class among all mollusks. This class experienced a characteristic torsion in their shell. This twist also involved the visceral mass, the mantle, and the mantle cavity. But by the time that this torsion occurred, the shell had already experienced a turn into a coil shape, which was then followed by its torsion.
The typical gasteropod´s shell is a conical structure composed of several tubular spirals containing the individual´s visceral mass. The biggest spiral ends as an opening from which the head and the food protrude.
The nucleus!
Hope this helps.