Answer:
D. A and B
Explanation:
Some <em>Apis mellifera </em>bees genetically inherit the hygienic behaviour to remove the dead and diseased larvae from beehives by uncapping the sealed cells. This activity maintains the overall health of the bee colony by protecting it from unwanted pests and pathogenic diseases. Usually both hygienic and non hygienic bees survive well.
Here, in hot summer many bees had perished due to disease and hot climate. Accumulation of dead larvae in hives of non hygienic bees would have invited more pathogens and created infectious conditions in summer. Hence their hives could not survive. Now the remaining hygienic bees will mate with each other and the offspring will have more chances to be born with the hygienic trait. Hence the frequency of alleles determining this trait will increase in this population. This would also be an example of natural selection as hygienic bees were preferred by the nature over non hygienic ones to survive in hot season.
The correct answer is that mammals use a closed, double loop , four chambered heart as a circulatory system of the body.
The circulatory system of mammals is closed system that consists of four chambers, two articles and two ventricles. The deoxygenated blood comes into the heart from one loop and the oxygenated blood from other loop from the heart is circulated to the whole body. This is called as double circulation.
Answer:
The correct answer is option E. "causation".
Explanation:
Causation is defined as the relation that exist between cause and effect, or what event lead to the development of another. In this example, the causation of the way that Australian bowers were developed will be the understanding of the physiological mechanism behind them. Therefore, in this study we want to understand the Australian bowers causation.
Well, to determine the type of sugar that is present and serves to play an important role in the overall structure and function of this particular nucleic acid is by the fact that the strand is single stranded, and not double stranded as in DNA. The only other commonly known Nucleic acid that is single stranded is RNA. Another clue or hint that points us in the direction to state that this a polynucleotide stranded molecule of RNA, is by the presence of the nitrogenous base, Uracil. DNA in place has thymine, uracil is only found on RNA, and is complementary to thymine, if used in transcription. Basically all of this information simply points to RNA, and the sugar contained in RNA would be ribose.
The answer is C. heliobactir Pylori
