What's the main role of the backbone in a vertebrate? a. It helps protect our body from becoming damaged.
b. It makes it harder to stretch and move.
c. It helps our muscles to become stronger.
d. It helps some species like humans to survive​

Read this passage: many manufacturers prefer plastic as a material for containers because it can be molded into many shapes. but plastic is not very strong. it must be fused with glass or steel for strength. it is also not very durable. even the strongest plastic can break under enough pressure. the biggest disadvantage to using plastic is that it does not decompose. while plastic can be recycled, doing so is tedious and difficult. while it may be more expensive and difficult to work with, aluminum is a much stronger building material with far greater tensile strength. it conducts electricity because it is metal. best of all, aluminum is very easy to recycle. even if it is thrown away, it decomposes much more quickly than most manufacturing materials. how does the compare-and-contrast organizational pattern of the passage support the author's purpose? a. the passage gradually leads up to the point about decomposition to inform the reader about the importance of recycling plastics. b. the passage lists the advantages and disadvantages of each material to make a case for the use of plastic and not aluminum in containers. c. the passage begins with a description of plastic's problems in order to call attention to the good qualities of aluminum. d. the passage shows the superiority of aluminum in order to make a case for the production of stronger plastics.

Why does the author of exploring the titanic give background information about his youth and education? to show his lifelong love for the ocean

Read the passage. when i consider how my light is spent ere half my days, in this dark world and wide, and that one talent which is death to hide, lodged with me useless, though my soul more bent to serve therewith my maker, and present my true account, lest he returning chide; “doth god exact day labor, light denied? ” in line 7 of sonnet xix by john milton, the speaker asks, “doth god exact day labor, light denied? ” what does his question mean? why must god make us suffer to work? what shall one charge god to work in the dark? how does god expect him to work when he is blind? is god trying me?