18. bones are both hard and flexible. they are light in weight, but durable. the outer layer of a bone is…

18. bones are both hard and flexible. they are light in weight, but durable. the outer layer of a bone is made up of a web of hollow passages. these tube - like passages allow the bone to be tough and light. it also allows for nutrients and waste to pass through them. a hollow ____ helps bones.\na gesture\nb axis\nc impression\nd structure

18. bones are both hard and flexible. they are light in weight, but durable. the outer layer of a bone is made up of a web of hollow passages. these tube - like passages allow the bone to be tough and light. it also allows for nutrients and waste to pass through them. a hollow ____ helps bones.\na gesture\nb axis\nc impression\nd structure

Answer

Breve explicación:

El texto habla de cómo la estructura hueca de los huesos les permite ser resistentes y ligeros, y también les ayuda a permitir el paso de nutrientes y desechos. "Estructura" es la palabra adecuada para describir esta característica. Las otras opciones no tienen sentido en este contexto.

Respuesta:

D. structure