The geologic time scale divides up the history of the earth based on life-forms that have existed during specific times since the creation of the planet

• Superposition is the principle that in undisturbed rock layers, the oldest rocks are onn the bottom.

• According to the principle of original horizontality, most rock-forming materials are deposited in horizontal layers.

• Lateral continuity is the principle that sediments are deposited in large, continuous sheets in all lateral directions.

• According to the principle of inclusions, if one rock contains pieces of another rock, the rock containing the pieces is younger than the pieces.

• According to the principle of cross-cutting relationships, if one geologic feature cuts across another feature, the feature that it cuts across is older.

Adaptations and variations occur because random changes create new features, and mental reproduction connect them in different ways.

Adaptations: Changes that help creatures living more well and better in the environment.

Variations: The original thing change to a unusual type.

1. We have played a fun game about ”Telephone game“, this is a small experiment to show our memories, and how things change quickly in a few minutes.

2. We did another experiment about sunflower seeds, we measured many sunflower seeds' length and width. This can makes us know that DNA will change even the things come from the same species.

Genetic engineering can produce improvements in crop plants, such as corn, wheat, and rice. Food products that have been genetically engineered are commonly referred to as genetically modified organisms, or GMOs.Scientists have made genetically engineered tomatoes with a gene that allows tomatoes to be picked while green and transported great distances before they ripen completely.

When plants and animals die, , any soft tissues animals do not eat are broken down by bacteria. Only a dead animals, hard parts, such as bones, shells, and teeth, remain. In most instances, these hard parts also break down over time. However, under rare conditions, some become fossils. The soft tissues of animals and plants, such as skin, muscles, or leaves, can also become fossils, but these are even rarer. Some fossils form when impressions left by organisms in sand or mud are failed in by sediments that harden. You observed this in Lab Return to Form. Examine the table below to see some ways that fossils can form.

I like fossils part more than DNA because I can see more new and different fossils. There's a lot of strange plants, animals, footprints, and bones fossils, and they are very interesting for me. I also like the way teacher always give us other informations that out of books.