Which substance cannot be broken down into simpler substances?

Biology

1 answer:

Readme [11.4K]3 years ago

6 0

Answer:

A Elements

Explanation:

Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means.

other answer

There are three sources of genetic variation: mutation, gene flow, and sexual reproduction. A mutation is simply a change in the DNA. Mutations themselves are not very common and are usually harmful to a population. Because of this, mutations are usually selected against through evolutionary processes

6 0

3 years ago

Which biome has the highest diversity of species?

Anika [276]

C). Tropical rain forest

8 0

3 years ago

Read 2 more answers

The Mesozoic era was the “Age of Reptiles.” At the end of the Mesozoic era, many groups of animals disappeared suddenly. Scienti

Savatey [412]

A large asteroid or comet impacted the earth.

8 0

3 years ago

Is balamuthia mandrillaris a public health concern worldwide?

True [87]

Balamuthia mandrillaris is an amoeba that was discovered in 1986 in the brain of the baboon that dies in San Diego Wild Animal Park. This can be found in the soil and water, therefore it is freely living. It is known to cause the neurological condition known as granulomatous amoebic encephalitis. In a study published by National Center for Biotechnology Information, it has a case fatality rate of >98%. Majority of this case can be found in warmer regions that affects individuals mostly of Hispanic origin. Documented cases had been reported from the Latin Americas in significant number, followed by the United States, Asian regions and some in Europe. However, a specific number of cases worldwide may never be known due to the following factors: lack of awareness, poor diagnosis and a poor public health system.

It is still yet to be known if its a serious public health concern worldwide.

7 0

4 years ago

The shock-absorbing pads between the vertebrae are formed of fibrocartilage. _________ The role of brown fat is to warm the body

alexandr1967 [171]

The shock-absorbing pads between the vertebrae are formed of fibrocartilage. TRUE

The role of brown fat is to warm the body; whereas, the role of white fat is to store nutrients. TRUE

Tendons and ligaments are composed mainly of dense irregular connective tissue. - FALSE

Macrophages are found in areolar and lymphatic tissues. - TRUE

Goblet cells are found within pseudostratified ciliated columnar epithelium. - TRUE

Epithelial tissues always exhibit polarity; that is, they have a free surface and a basal surface. - TRUE

Simple cuboidal epithelia are usually found in areas where secretion and absorption occur. - TRUE

Depending on the functional state of the bladder, transitional epithelium may resemble stratified squamous or stratified cuboidal epithelium. - TRUE

Elastic cartilage tissue is found in the walls of the large arteries that leave the heart. - TRUE

Cartilage tissue tends to heal less rapidly than bone tissue. - TRUE

Intercalated discs and striations are both characteristic of skeletal muscle. - FALSE

A smooth muscle cell has a central nucleus but lacks striations. -TRUE

Endocrine glands are often called ducted glands. - FALSE

5 0

4 years ago