Lesson 01.05 earth's early atmosphere
• describe the conditions on earth billions of years ago.
•summarize the main theories of how life began on earth.
• describe the relationship between organic compounds, nucleotides, rna, and a universal genetic code.
• explain the connection between the beginning of life and the universal genetic code of almost all organisms.

littering streams           is the answer

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: