Question

differences between fish and frog third point

Answer 1

Answer:

The big difference is that frogs are amphibians and breathe air. Most frogs lay their eggs in water and in the larval stage (tadpoles) live in water and have gills in order to breathe; when they mature they lose their gills and tails, move onto land and breathe air, some with lungs, others by absorbing oxygen through their skin. Some frogs bypass this larval stage.

Fish live in water, and have gills to extract oxygen from the water. There are a few fish, such as the walking catfish and the betta splendens that breathe air, but very few air breathing fish exist

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Answer 2

Research on a variety of animal species, ranging from insects to different vertebrates, has shown that body colors and patterns are traits under strong selection pressures. A classic and significant experiment on guppies indicated that color patterns often evolve as adaptations to environmental surroundings, in which it frequently resulted in cryptic coloration. Moreover, sexual selection acting on color and patterns can instead lead to colorful displays and also more diverse coloration patterns (Endler, 1980). In later studies using cichlid fish, color dimorphism has been found to be an important cue for non‐random mating and is also related to establishment of reproductive isolation resulting in speciation (Wagner et al., 2012), and color polymorphisms in frogs have been linked to reduced extinction risks at species level (Forsman and Hagman, 2009). Examples across the animal kingdom show the importance of cryptic colors and patterns as an anti‐predator strategy (Ryer et al., 2008; Cook et al., 2012). In lower vertebrates such as fish, different color morphs may however not be very fixed because body coloration can be manipulated at the individual level both by morphological (Sugimoto, 2002; Leclercq et al., 2010) and physiological color change (Aspengren et al., 2009a,b). In many aspects, there is still a lack of information concerning the effects of color change for animal behavior and evolution in particular. The power of phenotypic plasticity in terms of color change rather than genetic adaptations was in this context a surprising explanation behind the diversity of colors among the largely cryptic sculpins in different areas of Alaska (Whiteley et al., 2009). The ability to change color may thus have a suppressive effect on selection by allowing a larger niche. A comparative study on dwarf chameleons indicate that that social signaling rather than camouflage can be a driving force behind the evolution of color change (Stuart‐Fox and Moussalli, 2008), but seemingly social colors can also be cryptic depending on the distance, light, and vision of the observer (Marshall and Johnsen, 2011). These and many more studies show the pivotal but also complex roles of animal coloration and patterning in animal fitness and evolution.