Sulfur-Based Silver-Based Copper-Based Manganese-Based 
Answer: Copper-Based
Life in the ocean requires creatures to make all sorts of adaptations for everything from the cold, to the pressure, to the salinity, and the octopus is no exception. Unlike humans (and most other creatures for that matter), octopuses don’t have red blood, but blue.
Our blood is red because of the iron-based hemoglobin molecules within it. Octopuses, on the other hand, have hemocyanin which is like our iron-rich blood, but the iron atoms are replaced with copper. The copper-based blood molecules are more efficient at transporting oxygen when the temperature and oxygen levels are low, an adaptation well suited for life in the deep and cold waters of Earth’s oceans.
There is, however, one downside to this adaptation–they are, as a result of it, very sensitive to changes in the pH value of the water around them. With that in mind, many scientists are concerned about trends in ocean acidification and the impact it will have on octopus populations.
Image courtesy of Schmeeve.
Windows 10 has always included the Windows Defender antivirus, but many Windows users didn’t notice it was even there. To make it more obvious, Windows 10’s Anniversary Update adds a Windows Defender icon to the notification area on your taskbar.
Windows 10 comes with Windows Defender, a built-in antivirus tool to help protect your PC from malware. With the Anniversary Update, Windows Defender can keep protecting your PC by providing a second layer of protection, even if you install another antivirus.
We know, updating your PC is a hassle–but it’s important. New security flaws are discovered on a regular basis, and most companies are pretty good about about issuing fixes for those flaws as they crop up. Plugging those holes, however, depends largely upon you making sure things are properly
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If you have multiple people in your household and want them all to have access to SmartThings from their phones, here’s how to share access to SmartThings with anyone you want.
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If you use Google Chrome as your default web browser, you might have noticed a big change in its appearance. Google has changed Chrome’s theme to sport the Material Design style on some machines. If you prefer the old look however, don’t worry, it can be turned off–and if you don’t have this new
For most people, the default New Tab Page in Chrome works perfectly well for their purposes. But if you would prefer to choose what opens in a new tab for yourself, then we have some alternative solutions for you.
With the Windows 10 Anniversary Update, Cortana is now enabled by default on your lock screen–assuming you haven’t disabled her entirely. If you’d rather not have Cortana answering questions when your PC is locked, it’s an easy enough feature to disable.
