Please help in a middle of a test

The student's breath contains carbon dioxide which the weed uses during photosynthesis, creating oxygen as a by-product of the process, thus increasing the volume of gas the pond weed makes.

Explanation:

Plants take in carbon dioxide during photosynthesis, creating oxygen as a by-product.

correct answer: biotic and abiotic limitations

carrying capacity is defined as the total number of an organism who can be supported in a given area within the natural resources limit and without harming or degrading the natural, economic or the cultural environment present for the future generations.

carrying capacity is determined by the limiting factors, which are known to affect the natural resources available. it may include water, nutrients, minerals, space, light etc.

explanation:

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the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.