The answer is that the criteria of classification change whith the improved understanding of organisms around us
Answer:
A retrovirus is an RNA virus that is duplicated in a host cell using the reverse transcriptase enzyme to produce DNA from its RNA genome. The DNA is then incorporated into the host's genome by an integrase enzyme. The virus thereafter replicates as part of the host cell's DNA.
C.
Hydrosphere refers to all the water on the earths surface therefore making C the only correct answer.
Insulin receptors regulate glucose level in blood. Without that, glucose level would uncontrolled (not normal) (high and low) and it would be impossible to maintain homeostasis. I Hope I Helped You Good Luck.
Answer: B) II, IV, V
Explanation:
II, IV, V Sexual reproduction involves both parents. Chromosomes are passed to offspring in sex cells, egg and sperm. Offspring are not identical to either parent.
