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Early Plant Life

The kingdom Plantae constitutes large and varied groups of organisms. There are more than 300,000 species of catalogued plants. Of these, more than 260,000 are seed plants. Mosses, ferns, conifers, and flowering plants are all members of the plant kingdom. Most ...

Tác giả: Trần Bảo Ngọc viết 15:01 ngày 25/05/2018 chỉnh sửa

Magnets

come in various shapes, sizes, and strengths. All have both a north pole and a south pole. There is never an isolated pole (a monopole). All magnets attract iron, such as that in a refrigerator door. However, magnets may attract or ...

Tác giả: Trần Bảo Ngọc viết 15:01 ngày 25/05/2018 chỉnh sửa

The Biodiversity Crisis

Traditionally, ecologists have measured biodiversity , a general term for the variety present in the biosphere, by taking into account both the number of species and their commonness. Biodiversity can be estimated at a number of levels of organization of ...

Tác giả: Trần Bảo Ngọc viết 15:01 ngày 25/05/2018 chỉnh sửa

Meiosis

Sexual reproduction requires fertilization , a union of two cells from two individual organisms. If those two cells each contain one set of chromosomes, then the resulting cell contains two sets of chromosomes. The number of sets of chromosomes in a cell is ...

Tác giả: Trần Bảo Ngọc viết 15:01 ngày 25/05/2018 chỉnh sửa

Axial Muscles of the Abdominal Wall, and Thorax

It is a complex job to balance the body on two feet and walk upright. The muscles of the vertebral column, thorax, and abdominal wall extend, flex, and stabilize different parts of the body’s trunk. The deep muscles of the core of the body help maintain ...

Tác giả: Trần Bảo Ngọc viết 15:01 ngày 25/05/2018 chỉnh sửa

Inductance

Induction is the process in which an emf is induced by changing magnetic flux. Many examples have been discussed so far, some more effective than others. Transformers, for example, are designed to be particularly effective at inducing a desired ...

Tác giả: Trần Bảo Ngọc viết 15:01 ngày 25/05/2018 chỉnh sửa

Electric Potential in a Uniform Electric Field

In the previous section, we explored the relationship between voltage and energy. In this section, we will explore the relationship between voltage and electric field. For example, a uniform electric field E size 12{E} {} is produced by placing a potential ...

Tác giả: Trần Bảo Ngọc viết 15:00 ngày 25/05/2018 chỉnh sửa

Gonadal and Placental Hormones

This section briefly discusses the hormonal role of the gonads—the male testes and female ovaries—which produce the sex cells (sperm and ova) and secrete the gonadal hormones. The roles of the gonadotropins released from the anterior pituitary (FSH and LH) were ...

Tác giả: Trần Bảo Ngọc viết 15:00 ngày 25/05/2018 chỉnh sửa

Population Growth and Regulation

Population ecologists make use of a variety of methods to model population dynamics. An accurate model should be able to describe the changes occurring in a population and predict future changes. The two simplest models of population growth use ...

Tác giả: Trần Bảo Ngọc viết 15:00 ngày 25/05/2018 chỉnh sửa

Naming Skeletal Muscles

The Greeks and Romans conducted the first studies done on the human body in Western culture. The educated class of subsequent societies studied Latin and Greek, and therefore the early pioneers of anatomy continued to apply Latin and Greek terminology or roots ...

Tác giả: Trần Bảo Ngọc viết 15:00 ngày 25/05/2018 chỉnh sửa

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Early Plant Life

Magnets

The Biodiversity Crisis

Meiosis

Axial Muscles of the Abdominal Wall, and Thorax

Inductance

Electric Potential in a Uniform Electric Field

Gonadal and Placental Hormones

Population Growth and Regulation

Naming Skeletal Muscles

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