which of the following makes its own food using energy from the sun?

green algae
trees
sunflowers
all of the above

The answer would be "all of the above", because they are all plants or algae.

Plants and algae are both autotroph organisms. This means they use the process of photosynthesis to produce glucose (type of sugar = food for the organism) from minerals using the sun's energy.

To determine which of the given options makes its own food using energy from the sun, we need to understand the process of photosynthesis. Photosynthesis is the process by which plants and other organisms convert sunlight, water, and carbon dioxide into glucose (a form of sugar) and oxygen. This process occurs in a structure called chloroplasts, which are found in the cells of plants and some other organisms.

Now, let's consider the options:

1. Green algae: Green algae are photosynthetic organisms. They contain chloroplasts in their cells, which allows them to capture sunlight and produce their own food through photosynthesis.

2. Trees: Trees are also photosynthetic organisms. They have chloroplasts in their leaves, allowing them to convert sunlight into energy and generate food through photosynthesis.

3. Sunflowers: Sunflowers are another example of photosynthetic plants. They have chloroplasts in their leaves that enable them to produce food using energy from the sun through photosynthesis.

Therefore, the correct answer is "All of the above" because green algae, trees, and sunflowers are all capable of making their own food using energy from the sun.