The structure that connects the bones and allows movement is: MCQ with Answer and Explanation

Explanation:
The ozone layer, which absorbs harmful UV radiation, is located in the stratosphere. Chlorofluorocarbons (CFCs) release chlorine atoms in the stratosphere that catalytically destroy ozone molecules. Global warming is primarily driven by the greenhouse effect due to excess carbon dioxide and other greenhouse gases, not oxygen. Thus, statements 1 and 2 are correct.

Explanation:
Arthropoda is the largest phylum of the animal kingdom, and its defining characteristic is the presence of jointed appendages (legs, antennae, etc.). The word 'Arthropoda' literally means 'jointed legs'. They also have a chitinous exoskeleton and a hemocoel (blood-filled body cavity). Examples include insects, spiders, and crustaceans.

Explanation:
Uracil replaces thymine in RNA. In DNA, thymine pairs with adenine; in RNA, uracil pairs with adenine. Adenine, guanine, and cytosine are present in both. The presence of uracil and the sugar ribose (vs. deoxyribose) are key structural differences between RNA and DNA.