Answer:
The freshwater biome is defined as the biome that comprises the water bodies such as lake, pond, rivers and wetlands and where the concentration of salt is almost less than 1%. It occupies near about 20-25% of the total earth's surface.
Generally, the characteristics of the photic zone of a freshwater biome include-
- It forms the upper layer of the freshwater body, ranging from the surface of the water up to a certain depth.
- It is the layer where the sunlight can easily penetrate.
- The photosynthesis process is driven out extensively by the aquatic plants existing in this layer.
- The primary producers are present in this zone that provides the food to almost all the freshwater organisms.
- In this zone, the rate of respiration is equal to the rate of photosynthesis.
The order is:
Auricle (outer ear or pinna)
Auditory meatus (ear canal)
Tympanic membrane (eardrum)
The ossicles (ear bones) - malleus, then incus, then stapes
Oval window (where stapes transmits vibrations into cochlea)
Cochlea (the snail shell lines internally by specialized cells that form the organ of Corti)
Organ of corti (specialized “hair” cells that pick up vibrations from the fluid in the cochlea)
Vestibulocochlear nerve (transmits signals to brain for processing)
Temporal lobe (brain region that processes auditory information)
I’d recommend you do a quick google search as well to take a look at a diagram showing all this anatomy!
D.mutualism,both parties benefit
Speciation can be difficult to observe in nature, but the it is hypothesized that the following occurs in a allopatric speciation's intermediate stage:
(1) closely related species are differentiated through geographic variation (2) then there's reduced fertility in one a geographic race of the species (3) and in the geographic race of subspecies that are to become species.
