Answer:
B
Explanation:
Spirogyra is free-floating green algae present in freshwater habitats such as ponds, lakes, etc. Spirogyra is commonly known as water silk or pond silk. They have a filamentous and unbranched vegetative structure.
or
Spirogyra forms a silk like layer on the water. It is present in abundant amount on the fresh water bodies or slow running water. They are slippery in nature, so are commonly known as pond silk or water silk.
Answer:
It is called pen and it is located at the dorsal side
Explanation:
Squid belongs to the class Cephalopoda, subclass Coleoidea which is characterized by internal shell (unlike subclass Nautiloidea in which shell is located externally).
The shell of the squid (the pen) in very reduced and small, formed from chitin and located at the dorsal side. The pen provides attachment for muscles and it gives the squid stiffness.
Most likely, this internal shell evolved from the external shell, because it is believed the ancestral of the organisms from the Coleoidea was probably nautiloid-like.
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When a few individuals are isolated from the rest of the population and can have very different gene frequencies, it is called the Founder Effect. The founder effect is a type of genetic drift in which a small population is isolated. Due to this isolation, the population may have different gene frequencies than the rest of the larger population.
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Answer:
to see if they can find any other information to see what it worth how valuable it is or wht it is
The distinction between protostomes and deuterostomes is based on differences in their embryological development. Protostomes develop their oral end from their first developmental opening, while deuterostomes have their oral end develop from the second opening on the dorsal surface.
