Una navalla amb fulla d’acer té un valor de duresa estimat en 6,5. Tenint això en compte, quins minerals ratllaria? Es podria ratllar amb un cristall de quars? Raona la resposta.

answer:   option a) glucagon was secreted by his pancreas before he ate the cookies because blood glucose was low. insulin was secreted after he ate the cookies because his blood glucose was high.

explanation:

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.

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.