Answer:
El colágeno es una proteína que se encuentra en los huesos, en los cartílagos y en el tejido conjuntivo. Secretado por ciertas células y presente en la totalidad de los animales, el colágeno permite el desarrollo de fibras.
Explanation:
There are guard cells surrounding each stoma that cause them to open or close throughout the life cycle of the plant. This occurs in response to water and ions concentration in the plant cell.
Answer: Index fossils are used to identify layers of rocks. The layers will form an arrangement that relates to their age. In simpler terms, a layer that contains fossils are unique to that certain layer.
Index fossils are fossils that are mostly used by scientists due to it being easily found anywhere around the world and in abundant amounts. It can also be easily identified since they are fossils of widely varied organisms that lived during one short time period.
Answer:
Water's ionization property creates positive and negative ions, which are essential for chemical reactions.
Explanation:
A heterogeneous mixture composes of non- uniform components, so the concrete would be the answer, because you can tell the components from one another.
