Why can insects stand on water?
143476
It's Surface Tension! Molecules on the surface of a liquid have a strong attraction to each other, since there aren't any other molecules pulling on them from the air above. This forms a kind of elastic skin.\n\nWater striders (insects) can walk on top of the water because the surface tension is strong enough to hold them up.
125729
Fish and aquatic insects
365541
this does in fact relate to surface tension.  But if we want to look at this a little further...water is held together by intermolecular forces with one of the strongest being hydrogen bonding.  This is the reason there are water drops.  When a paper clip is set on clean water the hydrogen bonding and other intermolecular forces are strong enough to keep the paperclip afloat.  When soap is added to the water it begins to weaken the intermolecular forces of the water molecule.  When the paper clip is placed on top it will sink to the bottom.  These same ideas work for the little water bugs "walking on water".
637566
It looked like the hover boards worked with some sort of magnet on the bottom that probably conteracted with the earth's magnetic force. Since, water isn't magnetic, the hoverboard wouldn't work on water. Thats what I thought at least.
1125509
There are a couple of answers here. One could be because you have a light in your pool and like most bugs they are attracted to light. Second is because they have a very short life span hence the word "june" a one month bug. And three because they are very heavy with little wings and its hard for them to fly for long periods at a time.
37666
I take it that you mean "on leaves above the water level", because many species lay their eggs upon subaquatic plants or otherwise attach them to plants as protection. \nThe only fishes I've heard of that lay eggs on leaves are not from Africa but from South America (Amazon basin). The "splashing tetras" (Copella arnoldi) lay their eggs on the underside of objects (including leaves) just above the water and the male parent constantly splashes them with water to avoid dessication.\nI know this is not the answer but I'll keep searching!
672725
The hair or insect changes the shape of the surface tension of the water creating lots of little localised 'lenses' that focus the sunlight to spots on the bottom. If an insect with six legs lands on the water it'll create 6 little distortions or 'lenses', refracting the light into brighter spots and 'messing' up the insect's real shadow. The hair when resting on the surface doesn't touch in all places so again creating localised 'spots'.
386053
First of all, crabs as a whole cannot survive on land.  Only a relatively few species can leave the ocean.\n\nSo, why have some crabs made it out of the water while lobsters and shrimp have not?  Body structure.\n\nShrimp are primarily swimming creatures.  Their legs are not remotely designed to support their weight.  They are not likely to evolve into terrestrial animals from their current condition.\n\nLobsters may live on the submarine ground, but they have those long tails.  Those tails would not be easily supported above the water, leaving them to drag in the dirt.  Since the lobster has rather important stuff under it's tail (including gills), this would be fatal.  They aren't going to be able to make the transition to land animal easily.\n\nCrabs were all set to evolve to life on the land just from how they evolved under water.  They lack the long dragging tail, their gills are better protected, they have strong body lifting legs.  All that's really needed is some futher modification to the gills to let them survive short jaunts on land, things easy to evolve while living near the tide lines.\n\nThere are even some crabs in the amazon that are more terrestrial than marine!
921446
Bugs move their legs by increasing and decreasing the pressure of their internal liquids. When bugs die, the pressure decreases, and the legs curl up. Bugs are top heavy, so they flip over.
561062
its biological defense.  probably made from the types of plants it eats.  many caterpillars do this, grasshoppers do to.
1139260
Crabs have gills, but they usually can't stay on land for too long because they must keep their gills moist in order to breathe. They also have plates around their gills that protect them from losing moisture.\n\nCrabs that live on land live in cool, moist places so that they can breathe. They also drink water from the ground, or dew or water vapor, and can store it in their bladder or blood.\n\nThey do not have lungs.
678873
One of the difficulties that water plants have that land plants do not is gas exchange.  Plants need to be able to get air to their roots and aquatic plants usually do this through special tissues that lead to the air.
453236
no.  insects have six legs.
1045251
Flies avoid being hit by raindrops, not by dodging them, but by the drop of rain creating a tiny pressure wave ahead (below the raindrop).  This wave pushes the fly sideways and the drop of water misses it.\n\nIncidentally, this is also why fly swatters have holes in the surface, i.e. to reduce the pressure wave - otherwise, flies would escape most efforts to swat them.
117773
in the absence of an aquatic environent, some aquatic plants die, and mutated plants with special characteristics, such as seeds, live. these more "fit" plants multiply, and then you have a plant species that can adapt without an aquatic environment. \nthis is similar to (but much more complicated than) bacterial resistance to antibiotics, or crop insects resistance to insecticide.
734919
insect crawls and bug can fly
505010
most plants that require fertile soil and alot of water live in a delta. human like to live in delta because they can grow good crops. so other animals that feeds on the crops like the grasshoppers live on the delta. There is really no fish that live in a delta because it is where a river meets the ocean and neither salt water nor fresh water fish want to leave their habitat and go to the other side. (just think about the beach, you dont see any fish)