density and molecules

This week we learned about how water molecules work. When they are warm they move around alot. When they are cold they stay still. Mr. Finley put water in a glass bottle and then put a cork on top. He then put it over a flame and the cork flew off. This is because the water molecules moved up and pushed the cork off. He also put water in a bottle lew out a flame into it. Then he squeesed the bottle and when he let go, there was fog. This is because when there is more presure the particles move faster and there is evaporation. When there is low presure the particles go slow and there is less condensation or no fog. We also learned about density. Volume is how much space something takes up. If something is filled with particles and they are PACKED IN, IT IS DENSE AND HAS MORE mass.( sorry for the caps lock).

Classifications and Symbiotic Relationships.

This week I finished watching the documentaries. On the website I learned about all of the different skulls and what they ate . It was pretty interesting because some species ate fruits and nuts, while another ate meat. We also started learning about how species are catagorized. A man named Carolous Linnaeus camed up with this naming of species. He maned each species by two names. This system is called Binomial Nomenclature. for example, the scientific name for a human is called a homo sapien. His real name is Carl Linny. He changed it to its latin form just like he names species. We also learned about Symbiotic Relationships. There is parisitic which means that the host of the organism gets a negative effect and the other organism gets a posotive effect . For example, and mousquito gets blood from a host and the the host loses blood. Mutalistic is when the host gets a posotive effect and the organ ism gets a posotive effect. For example, an elefant can have birds on it that eat the bugs bothering the elephant. The bird gets to eat, and the elephant is free of flies.

Hominids

This week we learned about hominids.  A hominid is one of the humans closest ancestors.  The hominid walked upright.  There were many skulls found that date back to 4 million years old. The homo erectus has a big brain.  The body is also big.  The hominids are unlike monkeys because their big toe is close to there other toes just like humans.  Monkeys have a toe that is arched out from the others.  This is to help them climb trees.  Hominids are related to human, orangoutangs, gorillas, and monkey's.  

Evolution and populations

This week we learned about adaptions, population, and evolution. Evolution happens over time. It is the changing of species. We evoloved from apes. Things that come from evolution is adaptations, mutations,natural selections, and selective breeding.

Selective breeding- if the organim is best suited in the environment, then they will survive and reproduce. If the organism doesn't suit in the environment, they will die and not reproduce. If the population changes to quickly, then the organisms can't adapt and will die out.

Mutations-random change in the genes

Adaptations-the changes in physical or behavior traits in response to environment that occurs over time

Selective breeding- changes that are artificial that breed two organisms to make a better one

Population can change in many ways. There could be predators that attack the prey and effect the population. Also, environments can change the population. Disease can effect population too. If animals reproduce it will higher the population. When the predators population goes up, the prey go down. When prey population goes up the predator goes down.

Ugenics

Ugenics is the study of improving the human species or human population. Ugenics puts down or discourages the undesirable. It trys to stop people from having defective children that are undesirable.

Adaptation and Natural Selections

This week in science we did three simulations to show examples of population in habitats. This also taught us about adaptations. The simulations tought us how the creatures in our simulation adapted to different environments. This is possible if a blue starburst had a baby with a brown starburst. The offspring might be heterozygous. This means that it might be able to live in purple environment as well as a blue environment. We also learned about predators and prey in one of our simulations. If the prey camoflauges with its background then its population will go up. This is because the predator won't be able to see them and eat them least. If the prey doesn't camoflauge with its environment, the predator will see them and eat them more. Then their population will go down. Blending in with your environment is another adaptation. Our class said that adaptation can be "adapted" over time.

The Cockroaches Week/ Scientific Experiments

This week when we did our cockroach experiment. I learned that scientific experiments can always change. I thought that I had a great procedure, but then my group decided to change some things. The cockroaches can also change your experiment if they do something unexpected.
I also learned that a small thing can change a lot. For example. If you put one of the cockaroaches in a box, and it crawls out everytime, then you would have to add that to your conclusion. You might also change your bug and start over again.