In biology many organisms have been dissected so far, grasshoppers, fish, squid, clams, starfish and a few more. After dissecting these organisms and comparing their internal and external organs it seems that many of them have many differences and some similarities. The clam and squid for instance both live in water and are marine animals, however the only exoskeleton the squid has is the ink pen while the clam has its exterior shell. In addition, the clams are
animals that move as a young then at maturation they stop moving and stay in one place, on the other hand, squids move around using water sucked in from it's siphon and jetting it out. Moreover, the other difference between the squid and clam is the digestive system, the squid and clam both suck in their food but the squid has a parrot-like beak that helps break down food.The similarities between the clam and the squid is that both organisms have a siphon. Furthermore, the squid has a mantle that can be seen immediately while the clam also has a mantle but could only be seen when the shell is opened.
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| Clam |
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| Squid |
http://faculty.orangecoastcollege.edu/mperkins/zoo-review/clam-mussel/clam-mussel3.html
http://en.wikipedia.org/wiki/Squid
In this week, the most interesting dissection was the squid dissection. It was a simple dissection that wasn't that hard but definitely the most fascinating dissection. The part that really kept my attention was the part when we had to remove the "pen" from the squid. In addition, i learned some things that i didn't know about squids; they have beaks. [O_o] I also enjoyed figuring out how to use the "pen" and figuring out how to use the ink sac. I was really amazed that the squid even had a "pen" that looked similar to a birds wing but without the feather. It seems squids have more in common with birds than i thought especially since squids are marine animals and birds are mostly animals of the sky. :]
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| Squid |
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| Dissected Squid |
We shouldn't be using pestisides; and the number one reason the effect of pestisides on humans when we eat the produce that pestisides have been used on. In addition, the companies that sell the pestisides are getting a hefty profit while farmers have to pay for more and more pestisdes. Also the pestisides manage to kill the pest but there is always some pest that are able to survive the pestisides. The surviving pest are now not only immune to the pestisides but are also stronger. So when these pest reproduce the brand of pestisides no longer work on the pest so farmers have to buy more pestisides and therefore making the plant even more dangerous for the consumers. An easier and inexpensive way is to get rid of the pest naturally by buying other bugs that eat the pest and not the plants like ladybugs.
http://mrswolfgang.edublogs.org/2009/03/18/are-pestisides-good-or-bad/
The sexual reproduction in plants include two alternations between meiosis and fertilization. For the alternative part of meiosis the chromosomes reduce from diploids to haploids number. It is the opposite in fertilization where the haploids are increased to diploids after the two nuclei of gametes fuse together. Therefore these variation have to occur alternatively in order for sexual reproduction to run smoothly.
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/Alternation.html
http://en.wikipedia.org/wiki/Alternation_of_generations
