Explanation:

The correct answer is option 'A' - Weather.

Weather is an ever-changing element of the environment. It refers to the condition of the atmosphere at a particular place and time. Weather is influenced by a variety of factors such as temperature, humidity, air pressure, wind speed, and precipitation. These factors can change rapidly and affect the daily conditions experienced in an area.

Key Points:
- Weather is the state of the atmosphere at a given time and place.
- It is influenced by various factors like temperature, humidity, air pressure, wind speed, and precipitation.
- Weather conditions can change quickly and vary from day to day or even within a few hours.
- For example, one day the weather may be sunny and warm, while the next day it could be cloudy and rainy.
- Weather changes are often caused by different air masses moving in and out of an area, changes in atmospheric pressure, and the interaction of warm and cold air masses.
- The weather also plays a significant role in shaping the environment and ecosystems. It affects the distribution of plants and animals, the availability of water resources, and the overall climate of an area.
- Weather forecasts are made by meteorologists who study and analyze weather patterns and use various tools and technologies to make predictions about future weather conditions.

Conclusion:

Weather is an ever-changing element of the environment. It is influenced by various factors and can change rapidly, affecting the daily conditions experienced in an area. Understanding weather patterns and forecasting is important for various purposes, such as agriculture, transportation, and planning outdoor activities.