Complexity can be objectively measured to some extent, especially in the context of information theory and algorithmic complexity. In information theory, complexity can be measured using metrics such as entropy and Kolmogorov complexity, which provide objective measures of the amount of information or computational resources required to describe a system. However, when it comes to measuring the complexity of real-world systems or phenomena, there is often a subjective element involved, as different observers may prioritize different aspects of complexity. Therefore, while certain aspects of complexity can be objectively measured, the overall assessment of complexity may still involve some degree of subjectivity. **

The time complexity of Mergesort is O(n log n) in the worst-case scenario, where n is the number of elements in the array. This complexity arises from the fact that Mergesort divides the array into halves recursively and then merges them back together in sorted order. The space complexity of Mergesort is O(n) due to the need for additional space to store the divided subarrays during the sorting process. Overall, Mergesort is an efficient sorting algorithm that performs well on large datasets. **

One can get rid of complexity by breaking down the problem or situation into smaller, more manageable parts. This can help to identify the root causes of the complexity and address them individually. Additionally, simplifying processes, communication, and decision-making can help reduce complexity. It is also important to prioritize and focus on the most important aspects, while letting go of unnecessary details. Finally, seeking input and collaboration from others can provide fresh perspectives and help to streamline complex situations. **

One disadvantage of sustainability strategies is the potential for increased costs in the short term. Implementing sustainable practices and technologies often requires upfront investment, which can be a barrier for some businesses. Additionally, there may be challenges in finding sustainable alternatives for certain materials or processes, which can limit the feasibility of sustainability strategies. Finally, there may be resistance to change from stakeholders who are accustomed to traditional, non-sustainable practices. **

Composing two functions has a complexity of O(1), as it involves simply applying one function to the output of the other. The time complexity does not depend on the size of the input, as the functions are applied sequentially. Therefore, the complexity of composing two functions is constant and does not increase with the size of the input. **

Automation offers several advantages, such as increased efficiency, improved accuracy, and cost savings through reduced labor expenses. It can also help in performing repetitive tasks consistently and quickly, leading to higher productivity levels. However, automation can lead to job displacement and unemployment for workers who are replaced by machines. Additionally, the initial investment in automation technology can be costly, and there may be challenges in adapting to new systems and processes. **

Advantages of sustainability include preserving natural resources for future generations, reducing pollution and waste, and promoting a healthier environment for all living beings. By adopting sustainable practices, we can also create new economic opportunities and industries focused on renewable energy and eco-friendly products. However, some disadvantages of sustainability may include higher initial costs for implementing green technologies, potential resistance from industries reliant on non-sustainable practices, and the need for widespread behavioral and cultural changes to achieve long-term sustainability goals. **

The Big O notations for time complexity are used to describe the upper bound on the growth rate of an algorithm's running time as the input size increases. Some common Big O notations include O(1) for constant time complexity, O(log n) for logarithmic time complexity, O(n) for linear time complexity, O(n^2) for quadratic time complexity, and O(2^n) for exponential time complexity. These notations help in analyzing and comparing the efficiency of different algorithms. **