Whales play an important part within the marine ecosystem, and if they were to disappear, the delicate balance of nature would be disrupted. According to Scitable, every time a whale dies, it leaves behind a carcass that provides food and vital nutrition for literally hundreds of marine life organisms. For instance, species of scavenger crustaceans and worms feast upon whale carcasses for sustenance.
Other species of fish, including sharks, also obtain food from a whale carcass. Without this bountiful source of food, certain parts of the ocean would cease to thrive.
Living whales also heavily contribute to the marine ecosystem in the form of whale feces. According to the Columbia Basin Fish and Wildlife News, a study found that whale feces is filled with rich nutrients that include nitrogen, which stimulates the growth of plants. Organisms, such as plankton, that feed the ocean food chain also benefit from tons of whale feces floating on the ocean's surface. The disappearance of this source of natural nitrogen is likely to have a negative effect on plant and food production.
An overpopulation of sea lions would quickly be evident as soon as the whales that prey on them vanished. Likewise, the economies of Canada and the United States would suffer from a lack of tourist dollars because whale watching is very popular.
Answer:
Hypothesis: a proposed explanation for a phenomenon.
Explanation:
Answer:
Trace fossils may consist of impressions made on or in the substrate by an organism. For example, burrows, borings (bioerosion), urolites (erosion caused by evacuation of liquid wastes), footprints and feeding marks and root cavities may all be trace fossils.
Explanation:
Answer:
1. Option A
2. 0%
Explanation:
A) Given Curly hair is dominant over straight hair.
Let the allele representing straight hair be "c"
and the allele representing curly hair be "C"
a) a woman heterozygous for hair curl, a man heterozygous for hair curl will
Cc * Cc
CC, Cc, Cc, cc
75 % curly and 25 % straight hairs
Hence, option A is correct
B) TT * Tt
When TT or Tt is crossed with tt, not all offspring will be tall
In order that all offspring are tall , the probability that both the parents must be homozygous recessive is 0%
Answer: b. dissociative disorder
Explanation:
A dissociative disorder is associated with the conditions that involve the breakdown or disruption of the memory. In this disorder the sense of awareness, identity and perception are lost. The person looses consciousness. The patients suffering from dissociative disorder use separation or dissociation as a defense mechanism to deal with the condition.