answer:Note that for every alpha neq 0, the function x mapsto x^alpha is an automorphism of U. This observation is crucial in addressing both inquiries. In the case of U, as it forms a semigroup with the operation of multiplication, definable elements are limited. Since the structure includes the identity elements 0 and 1, these are naturally definable. However, it is important to recognize that no other elements can be explicitly defined, as the automorphisms preserve the structure and relations, preventing any unique definability. Regarding the structure (mathbb{R}; 0, +), the less than relation (<) is indeed definable. Although not immediately obvious, we can define x < y as follows: exists z in mathbb{R} (x + z = y wedge z neq 0). This definition captures the essence of the less than relation without relying on negative numbers, as it effectively states that there exists a positive distance between x and y. These results highlight the difference in definability between the two structures due to the presence or absence of specific properties and operations.

answer:-frac{29997}{2}

answer:Decomposition reaction occurs when chlorophyll breaks down into simpler substances. Chlorophyll is a green pigment found in plants and some other organisms that is responsible for photosynthesis, the process by which plants convert sunlight into energy. When chlorophyll breaks down, it is broken down into simpler substances such as pheophytin, chlorophyllide, and phytol.

answer:Articles of incorporation typically include the following key information: the corporation's name and address, its purpose, the number of authorized shares, the names and addresses of the initial directors, and the incorporator's name and address.