Question

which colour present in amphioxus blood

Answer 1

Explanation:

The lancelets, also known as amphioxi (singular, amphioxus), consist of about 30-35 species of "fish-like" benthic filter feeding chordates [2] in the order Amphioxiformes. They are the modern representatives of the subphylum Cephalochordata. Zoologists are interested in them because they provide evolutionary insight into the origins of vertebrates. Their genomes hold clues about the early evolution of vertebrates, by comparing genes from lancelets with the same genes in vetebrates, the change in gene function as vetebrates evolved can be discovered.[3] The genome of a few species in the genus Branchiostoma have been sequenced: B. floridae [4], B. belcheri [5], B. lanceolatum [6].

Answer 2

Due to the absence of red corpuscles and respiratory pigment, the amphioxus' circulatory system pumps blood through colorless capillaries.

• The circulatory system also called the vascular system, transports oxygen and nutrients throughout the body and aids physiological balance.
• Blood can be seen flowing between the blood vessels.
• The bulk of blood vessels in the amphioxus circulatory system, including branchiostoma, are referred to as arteries or veins because they resemble blood vessels seen in vertebrates.
• Only the dorsal aorta has endothelial lining.