In order to survive, all organisms must carry out:

1. autotrophic nutrition
2. heterotrophic nutrition
3. enzyme-controlled reactions
4. the process of locomotion

Help??

Heterotrophic nutrition

To determine the correct answer, let's break down each option:

1. Autotrophic nutrition: This refers to the ability of organisms to produce their own food using energy from sunlight or inorganic chemical reactions. Examples of organisms that carry out autotrophic nutrition include plants, algae, and some bacteria. However, not all organisms require autotrophic nutrition to survive.

2. Heterotrophic nutrition: This refers to the ability of organisms to acquire energy by consuming other organisms or organic matter. Most animals, fungi, and some bacteria are heterotrophs. This is a common method of obtaining nutrients among organisms, including humans.

3. Enzyme-controlled reactions: Enzymes are biological catalysts that speed up chemical reactions within organisms. Enzyme-controlled reactions are involved in various processes, such as breaking down food, transporting molecules, and synthesizing complex compounds. While enzyme-controlled reactions are vital for many biological functions, not all organisms require them to survive.

4. Locomotion: Locomotion refers to the ability of organisms to move from one place to another. While locomotion is crucial for many organisms to find food, escape predators, and explore their environment, not all organisms require locomotion to survive. For example, some plants are immobile and rely on other means, such as wind or animals, for pollination or seed dispersal.

Based on the given options, the only one that is universally necessary for all organisms to survive is option 2: heterotrophic nutrition. This is because all organisms need a source of energy to survive, and consuming other organisms or organic matter is a common way to obtain that energy.

Therefore, the correct answer is: 2. heterotrophic nutrition.