Which of following roles do living organisms play in the development of healthy soil?Multiple select question.Microscopic organisms provide soil with structure and loose texture.Worms and nematodes create air spaces as they burrow through soil.Certain species of bacteria act as natural pesticides, helping to keep soil free of pests.Soil bacteria and algae recycle leaf litter and make nutrients available to plants.Bacteria, algae, and fungi release oxygen into the soil for use by other organisms.

All of the roles mentioned are played by living organisms in the development of healthy soil:

1. Microscopic organisms provide soil with structure and loose texture: This is true. Microorganisms like bacteria and fungi contribute to the formation of soil aggregates, which give the soil its structure and help in water retention and air circulation.

2. Worms and nematodes create air spaces as they burrow through soil: This is also true. These organisms, known as soil fauna, burrow through the soil creating channels that allow air and water to penetrate deeper into the soil.

3. Certain species of bacteria act as natural pesticides, helping to keep soil free of pests: This is true. Some bacteria produce substances that are toxic to certain pests, thus acting as natural pesticides.

4. Soil bacteria and algae recycle leaf litter and make nutrients available to plants: This is true. Decomposers like bacteria and fungi break down dead plant material, releasing nutrients back into the soil that can be used by plants.

5. Bacteria, algae, and fungi release oxygen into the soil for use by other organisms: This is partially true. While these organisms do release some oxygen as a byproduct of photosynthesis, the primary source of oxygen in the soil is from the atmosphere, through the process of diffusion.

So, all the options play a role in the development of healthy soil.