Adaptations and variations happen because the animals need to survive in the environment where they live in. Adaptation indicates advantageous changes favored by the environment. Sometimes the environment changes because of various factors, like climate, food and the ecosystem.

Adaptation is when the change makes the living thing survive more easily in the environment.

On the other hand, variations happens because of genetic differences, when the same kind of species is different and not exactly the same. Some are different, like the size or color. The differences come from the genes, and then they pass to the next generation. If one variation helps the organism survive, it become a new species after many years.

Without variation and adaptation, species cannot live for a long time because they cannot fit with the environment and climate around them.

In class we did an experiment that we are measuring 10 sunflower seeds. We check the length and the thickness of each seed by using a ruler. At first it look easy, but I learn that every seed is not the same size. Some are longer, some are shorter, and also the thickness can change too. By noting down the number, we can compare and see the variation between them. From this experiment I learn that things that look almost the same still have differences. Measuring help us understand that thing are always different with a little bit changes, and these changes are very important for biology science

When plants and animals die, the soft part of the animals like the flesh will be eaten and decomposed. Then the bones or the hard part of the plants and animals will remain. After a few years, the bones are covered by mud or sand and then become fossils. There are many types of fossils, such as minerliation and carboniation. The most common type of fossil is carbonization, which is formed from the pressure under the mud and heat in a low-oxygen environment.The carbonized fossils are often thin and preserved on a flat surface or rock.

This unit is very interesting for me. I really enjoy learning about genetic variation. I didn’t know that just by measuring sunflower seeds we can 

see how living things are different, even though they look the same from the outside. The GMO topic is also very inspiring. I didn’t know that scientists used to make crops stronger or have more nutrition. It makes me think differently about the food we eat. Fossils is another thing I really like. I always think they are amazing, and now I understand better how they were formed and what they can tell us. But the most surprising thing for me is geologic time. When I first learned that human history is only a very small part in Earth’s time, I was really shocked. This unit helps me to see how everything is connected, and it makes science more real and exciting to me.

F = ma is a physics thing that show how things move change. F mean force, m mean mass, and a mean acceleration. It tell that force you push or pull is same like mass times how fast it go or turn. When you push something, it move faster or slower or turn, that because of force. If thing is heavy, you need more force to move it. If you push hard, it go faster. So F = ma show how force and mass make motion change.

Frictional force is a force that happen when two thing touch each other and try to stop them from moving. It like a push back that make moving thing slow down. For example, when you slide a book on table, it stop after some time because friction from table push back on book. Friction can be big or small, depend on what surface is and how heavy the thing is. Friction make moving object need more force to go, but it also help to stop things and not slide forever. So friction change motion by slow down or stop object from moving easy.

In this experiment, we use ping-pong balls to see what happen when things crash from different side. We push the balls to each other and watch how they bounce back after they hit. I like this activity because it make me understand force more easy when things smash. I see that the way the ball go and how fast it move change when we push it hard or soft. It show me that force go on both balls, not only one ball. This experiment make learning about motion and force more fun and more clear for me.

Potential energy is stored energy. It depends on an object’s position or shape. For example, when you pick up a pencil and put it on a table, you use your body’s energy to lift it. Now, that pencil has potential energy because it is high up.

Kinetic energy is the energy of motion. When the pencil rolls off the table and falls, the stored potential energy changes into kinetic energy. Simply put, if an object is moving, it has kinetic energy. It is much easier to understand than potential energy because you can see the movement happening.

Magnetic force is a interesting non-contact force that come from the movement of electric charges. It can make objects pull or push each other without touching. Every magnet have a north pole and a south pole, and different poles attract but same poles repel. A common example are a compass needle that point with the Earth magnetic field. In technology, electromagnets use electric current to make a temporary magnet, and it are very important for motors and MRI machine. This invisible force is strong enough for lift heavy scrap metal or make a fast maglev train stay above the tracks.

This unit was very fun because I learn a lot about forces, energy, gravity, and airflow. My favorite part is learning about potential and kinetic energy because it help me understand how energy is store and how it change into movement. It is hard to choose only one favorite topic since everything was very interesting, but I also really like learning about non-contact forces. We learn how magnets work and how the Earth magnetic field protect our electronics from bad solar flares. We also spend time learning about gravity and why it exist. Overall, this unit help me understand the invisible forces that move everything in our world.