Match the following terms and definitions.

1. outer layer of cells

jejunum

2. tube connecting the mouth to the stomach

epidermis

3. iron compound in red blood cells

hemoglobin

4. the distal half of the small bowel

esophagus

5. the middle part of the small bowel

ileum

1. Outer layer of cells --- Epidermis

2. Tube connecting the mouth to the stomach --- Esophagus

3. Iron compound in red blood cells --- Hemoglobin  

4. The distal half of the small bowel --- Ileum

5. The middle part of the small bowel  --- Jejunum

Explanation:

1- The epidermis, in vertebrates, is the outer layer of the skin. It is the body's most important barrier to the external environment of the skin.

2- The esophagus is a part of the digestive system of both vertebrate and invertebrate living beings formed by a muscular tube of about 25 centimeters, which connects the pharynx with the stomach.

3- Hemoglobin is a blood hemoprotein that transports oxygen from the respiratory organs to tissues, carbon dioxide from tissues to the lungs that eliminate it and also participates in the regulation of blood pH, in vertebrates and some invertebrates.

4- The ileum is the final section of the small bowel, in the digestive system.

5- The jejunum is one of the parts of the small bowel, between the duodenum and the ileum. Its function is to perform the absorption of the substances of the food chyme.

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation:

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.