<span>When there is no oxygen, or the organism cannot use oxygen for respiration.
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Both flagella and cilia have a common structural arrangement of microtubules referred to as "9 + 2 array." A single cilium or flagellum is made up of string of nine microtubule doublets that surround a single microtubule doublet in the center.
Flagella are hair-like structures which are usually long and they extend from the plasma membrane. They are used to propel or move an entire cell, for example sperm cell.
Cilia are short hair-like structures that are used to move entire cells. An example is paramecia. Cilia can also be found lining the outer surface of cells such as those of the respiratory tract where they move trapped particles up toward the nose and mouth.
Answer:
2. The gene responsible for eye color is on the X chromosome.
Explanation:
<em>For X-linked genes, a male can either be affected or unaffected because the Y chromosome is hypothesized not to carry any gene. Females on the other hand can be a carrier, affected or unaffected because the two sex chromosomes carry genes.</em>
If eye color allele in drosophilia is represented by R, the cross between F1 red-eyed heterozygous female and red-eyed males can be illustrated below:
Red-eyed heterozygous female = 
Red-eyed male = 
x
Progeny: 
Out of the 2 male progeny from the cross, 1 (
) is white-eyed while the remaining one () is red-eyed
Hence, the result shows that the gene for eye color in Drosophilia is X-linked.
Option 2 is the correct answer.
A: because if we keep doing what we are to the world it will keep getting hotter and hotter
