Arthropoda and molluscs have open circulatory systems - meaning haemolymph (Their equivalent to blood) directly bathes the tissue, and isn't enclosed in blood vessels, as seen in a closed blood system, as in humans for example.
The process of __clonal selection__
Answer:
Estrous cycles give females repeated opportunities to become pregnant throughout their productive lifetime. The cycle is regulated by the hypothalamic-pituitary-gonadal axis, which produces hormones that dictate reproductive events.
Explanation:
Answer:
cDNA library.
Explanation:
Genomic library may be defined as the collection of all the genomic DNA of an individual. The genomic library is constructed by the digestion of digestion of DNA fragments and there further transfer in the vectors.
cDNA library is prepared in case of eukaryotes because the complementary DNA is produced from the RNA. The eukaryotes DNA is interrupted with exons. In case of spider, the cDNA linrary is prepared because its DNA is interrupted with exons.
Thus, the answer is cDNA library.
(D) edge-adapted species
<h3>What is Niche?</h3>
An organism's functional place in an ecosystem is known as its niche.
The biotic elements, which include living components like animals, plants, and fungus, as well as abiotic factors, influence the niche, which is more precisely referred to as the "ecological niche". Abiotic variables are the non-living elements of the environment, including the availability of water, sunlight, and other resources like food and other nutrients.
The distribution and abundance of these elements, as well as how a creature interacts with and changes them, determine its niche within an ecosystem. For instance, when resources are plentiful, a population increases, yet by doing so, the population increases the amount of resources available to predators.
Learn more about Niche with the help of the given link:
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