I think I got it

carbohydrates
lipids
proteins
nucleic acids

correct?

still haven't found the basic element yet. I think it is carbon, but can't find anything definte

Yes, you are correct in identifying carbohydrates, lipids, proteins, and nucleic acids as the four major types of biological macromolecules. Now, to determine the basic element found in these macromolecules, let's break it down step by step.

1. Start by understanding the general composition of each macromolecule type:
- Carbohydrates are composed of carbon (C), hydrogen (H), and oxygen (O).
- Lipids are composed mainly of carbon (C) and hydrogen (H), with a smaller amount of oxygen (O) in some cases.
- Proteins are composed of carbon (C), hydrogen (H), oxygen (O), and nitrogen (N), and sometimes sulfur (S).
- Nucleic acids are composed of carbon (C), hydrogen (H), oxygen (O), nitrogen (N), and phosphorus (P).

2. Analyze which element is common to all four macromolecule types. In this case, carbon (C) is found in all four: carbohydrates, lipids, proteins, and nucleic acids.

So, the basic element common to all these macromolecules is carbon (C). Carbon is often referred to as the "building block of life" because it is essential for the formation of organic compounds, which are the basis of all living organisms.

To find more definitive information, you can consult reliable sources such as biology textbooks, scientific articles, or educational websites specializing in the topic of macromolecules or biochemistry. These resources will provide more comprehensive and detailed explanations.