Answer:
The liver have a hepatic portal vein and a hepatic vein for blood flow and transport of nutrients.
Explanation:
Hepatic portal vein is also known as portal vein that carries blood from the organs (gastrointestinal tract, pancreas and gallbladder) to the liver. The nutrients are also transfer by the hepatic portal vein.
Hepatic vein: This vein carry deoxygenated blood into the inferior vena cava from the liver. Total three hepatic veins brings deoxygenated blood from right, left and middle part of liver.
Answer:
Class Aves
Explanation:
Class Aves consist of birds. Birds have feathers and lightweight bones to help them fly.
Answer:
In an area of alpine glaciation, sinuous, sharp-edged ridges called <u>aretes</u> and sharp, pyramid- like peaks called<u> horns</u> are common features.
Explanation:
The glaciers in a valley form various features due to erosion. Two of these features are the aretes and horns.
When two glaciers gradually wear away, a willowy ridge is made which separates one valley from another. This is known as the Arete. For example, The “Garden Wall” made in the Glacier National Park, Montana
When several Aretes crumble, horns are formed. The horns can be seen as the peaks on the top of the mountains. E.g The Matterhorn in Switzerland
The correct answer is 4.) Eventually they become separate species
A process of formation of a new species from an existing species is called speciation.
When a single species changed into two or more separate species, is called speciation. Speciation can take place due to reproductive isolation. In reproductive isolation, the separated species no longer can interbreed among themselves. This is happened due to mating differences, sterility or environmental barriers which finally results into the adaptive splitting into two species.
I remember answering this question. The answer would be Option B. Chitin, in arthropods, is a structural carbohydrate that forms their exoskeleton. It is a long chain of polymer of an N-acetylglucosamine. Hope this answers the question.\
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