Hereditary Material Basic Teaching Design (Jinan Edition) Teaching Plan

Inherited Material Foundation Topic 4.4.1 Inherited Material Foundation Course Type Newly-approved Auditor Unit Qingyun Wuzhong Primary and Secondary Student Zhang Jie Student Name Learning Objective Knowledge Objective: 1. Explain that the nucleus is the genetic control center and DNA is the main genetic material 2. Try to describe the relationship between chromosomes, DNA, and genes. The goal of the relationship: Through the analysis of the experiment of the grafting of Umbellaria, train students to observe and analyze the problem ability and thinking ability. "Material" scientific viewpoint.

The bristle taken from boars are harder than badger hair and are at first very coarse, which is not so comfortable on the skin. The courser texture of the bristles makes it very useful for lathering soaps well because of its ability to agitate the surface of the soap very easily. Over time, the tips of the bristles will soften and feel a bit more broken in, but will never be as soft on the face as badger hair. Colors range from yellow to white, often with a black imitation band as decoration. 

Synthetic bristles have been significantly improved in recent years. The cheapest brushes still use relatively thick nylon bristles and are not particularly comfortable. But you can also find amazing products made from high-quality synthetic fibers analogously to the best natural badger hair. In particular, the synthetic  brushes made by the German brand are top notch. The first version of these brushes wasn`t as good but these new fibers are astonishingly soft and extremely long-lasting. In fact, the tips are softer than any Animal Hair brush, while also being less sensitive in everyday as they dry faster than natural hair. This kind of synthetic bristle was designed and engineered specifically for shaving and some like them better than animal hair brushes. On top of that, these brushes are PETA-approved, vegan, and perfectly suited for men who are allergic to animal hair or badger hair. As if that wouldn`t be enough, you will also need about half of the amount of shaving cream or soap compared to an animal hair brush.

Shaving Brush

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