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3 years ago

Please answer asap i only have 30 minutes to submit

Biology

2 answers:

AVprozaik [17]3 years ago

6 0

Answer:

A is the youngest layer because all of the older layers are on the bottom.

Explanation:

natka813 [3]3 years ago

6 0

Answer:

Explanation:

A has the youngest fossils

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When a person is experiencing heartburn, he or she feels a burning sensation in the throat and midchest. Think about the structu

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The muscle at the end of the esophagus is not able to close, which allows stomach acid and digested food to go back up into the esophagus.

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3 years ago

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The original source of all genetic variation is _____. the original source of all genetic variation is _____. sexual reproductio

IceJOKER [234]

The answer for the above question is Mutation.
Mutations are random spontaneous changes that occur suddenly in the DNA. A single mutation can have a large effect, however in may cases evolutionary changes are based on the accumulation of many mutations. The gene flow is any movement of genes from one generation to another and is an important source of mutation

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4 years ago

Which of the following is NOT an effect produced by the sympathetic nervous system?

Yuliya22 [10]

Answer: A) Increased GI mobility

Explanation: They sympathetic nervous system inhibits the activity if the stomach, therefore, GI mobility decreases and does not increase. The parasympathetic nervous system is the one that increases the GI mobility.

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3 years ago

Describe all muscle tissues, including cell shape, layers, intercellular connections,

zmey [24]

<h2>Description of muscle tissues. </h2>

Explanation:

There are three types of muscle tissue are cardiac, smooth, and skeletal.

1. Cardiac muscle tissue: It is located in the walls of the heart.

They appear striated.

Control is involuntary.

Function: To pump blood through the blood vessels in your body.

2. Smooth muscle tissue: It is located in walls of hollow visceral organs, except the heart.

They appear spindle-shaped.

Control is involuntary.

Function: To move food through the digestive tract.

To regulates air flow in lungs.

3. Skeletal muscle tissue: It occur in muscles which are attached to the skeleton.

They appear striated.

Control is voluntary.

Function: To support the body.

It makes bones and other body parts move.

Cell shape : There are different shapes of cells which are as follows:

1. Squamous 2.Cuboidal 3. Columnar 4. Polygonal 5. Stellate

6. Spheroid 7. Discoid 8. Fusiform 9. Fibrous.

Muscular layer: The muscular layer is present in many organs in the vertebrate body.

It is responsible for peristaltic movement in body.

There are two layers of muscle.

1. Inner 2. Outer layer.

Inner layer: The muscle of the inner layer is arranged in circular rings around the tract.

Outer layer: the muscle of the outer layer is arranged longitudinally.

Intercellular connections or junctions: These are the structures which provide adhesion and communication between cells.

There are mainly three types of junctions:

1. Tight junctions: It help to stop substances from leaking across a tissue.

2. Adhering junctions: It perform the function of cementing so as to keep neighbouring cells together.

3. Gap junctions: It facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules.

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3 years ago

The growth of mosses and lichens on a bare volcanic region helps prepare the area for the next stages of succession. How do moss

melamori03 [73]

Answer:

The correct answer is - B. they build up soil deposits on the rocky ground.

Explanation:

Lichens and mosses are known as the pioneer species as they prepare the particular region for the next stages of succession on the bare volcanic region. Lichens and mosses grow on the bare rocks and secrete acids to break the rocks and start soil production.

The soil deposits produced by breaking the volcanic rocks by secreting acids from mosses and lichens. Even after dying these species leads to thickening of the soil and increase organic matter for the next stages to grow.

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3 years ago