Which of the following are true of scientific hypotheses? (Check all that apply.)
They can represent someone's opinion about why change occurs.
O They can be tested through observations of natural events.
O They must be rejected if no evidence is found to support them.
They must be agreed upon by all scientists before they are tested.
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I think it's these two

O They can be tested through observations of natural events.

O They must be rejected if no evidence is found to support them

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.

satellites are frequently used to make observations of the orbit on earth