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Back in the day of that ancestor algae
Public Group active 1 month agoBack in the day of that ancestor algae, at least one population accumulated certain traits that allowed individuals to live on land instead of in the water. http://www.bu.edu/comtalk/2017/03/02/prettybird-lady-gaga/ These populations would eventually evolve into the first land plants.
And just imagine what that transition would be like if you were a photosynthetic organism. Underwater, the sunlight is filtered by things like plankton http://www.thedrum.com/news/2017/11/03/3-conference-asks-the-youngest-generation-about-their-successful-mothers-and-gets and the water itself. But on land, these starter plants could enjoy the sun undiluted and pure, getting way more than was possible underwater.
Life on the sunny side of the street came with some disadvantages, however. Being out of the water meant that obtaining water became more of a challenge. http://mic.com/articles/141247/here-s-what-it-would-look-like-if-colleges-were-honest-about-campus-sexual-assault Also, living on land means living with more gravity, and that put extra stress on plants’ external and internal structures.
The difficulties of living on land put selective pressure on newly arising mutations, which over time led to some of the incredible adaptations we see in the http://www.self.com/story/these-fake-college-acceptance-letters-make-a-sobering-point-about-sexual-assault plant kingdom. Let’s check out some of these plant adaptations for life on land. The move onto land meant that plants were permanently exposed to the air and drying out was a major concern. And it’s not like plants could just grab some lotion…except they kinda did.
Many plants evolved a covering called the cuticle, which contains wax. That wax compound is hydrophobic, meaning it doesn’t dissolve in water, so the water https://thinkprogress.org/college-paper-ad-warns-prospective-students-that-rape-could-be-part-of-the-price-of-admission-d58052bab3da/ is kept inside. Brilliant, right? Not only did they figure out waterproofing, but plants ended up with another special adaptation on their outer layer.
Most plants have special pores called stomata. These openings allow the plant to exchange things like oxygen and carbon dioxide with the air. But water http://www.teenvogue.com/story/college-acceptance-letter-anti-rape-ad can evaporate from stomata, and that can lead to dehydration. gh.Not to fear thou Stomata have special mechanisms that allow them to actually close when it’s hot outside.
