Which two of these characteristics are examples of endoskeletons? a. scales in fish b. bones in mammals c. calcium-rich plates in echinoderms d. appendages in arthropods

Option B and option C are correct.

Explanation:

Endoskeleton - An internal support structure or skeleton is on the inside of a body, composed of calcium or mineralized tissue.

B. Bones in mammals - are endoskeleton, it supports the body in its shape.

C. Calcium-rich plates in echinoderms are acts like exoskeletons but most of the cases a thin tissue surround skeleton so it is an endoskeleton.

the answer is otpion c) understanding

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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.