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Explain how population sizes in nature are regulated

goblinko [34]

Answer:

Understanding Populations

Section 1 How Populations Change in Size

Objectives

Describe the three main properties of a population.

Describe exponential population growth.

Describe how the reproductive behavior of individuals can affect the growth rate of their population.

Explain how population sizes in nature are regulated.

What Is a Population?

A population is a group of organisms of the same species that live in a specific geographical area and interbreed. A population is a reproductive group because organisms usually breed with members of their own population.

Properties of Populations

Density is the number of individuals of the same species that live in a given unit of area. Dispersion is the pattern of distribution of organisms in a population. A population’s dispersion may be even, clumped, or random. Size, density, dispersion, and other properties can be used to describe populations and to predict changes within them.

How Does a Population Grow?

A population gains individuals with each new offspring or birth and loses them with each death. The resulting population change over time can be represented by the equation below.

Growth rate is an expression of the increase in the size of an organism or population over a given period of time. It is the birth rate minus the death rate. Overtime, the growth rates of populations change because birth rates and death rates increase or decrease. For this reason, growth rates can be positive, negative, or zero.

For the growth rate to be zero, the average number of births must equal the average number of deaths. If the adults in a population are not replaced by new births, the growth rate will be negative and the population will shrink.Explanation:

8 0

3 years ago

Many people in the developing world who depend on rice in their diet suffer from diseases related to deficiencies of

Usimov [2.4K]

They have a deficiency of B vitamins which comes from red meat.

3 0

3 years ago

Can anybody say what phase each letter goes with? I am having a very hard time

ioda

Answer:

A is called Prophase

B is called Anaphase

C is called Metaphase

D is called Telophase

Explanation:

These can get confusing but I'll explain it for you.

The first stage of mitosis is Prophase.

In this stage the chromosomes become visible and the centrioles separate and move to opposite poles of the cell.

The second stage of mitosis is Metaphase.

In this stage the chromosomes line up across the center of the cell and become connected to the spindle fiber at their centromere.

The third stage of mitosis is Anaphase.

In this stage the sister chromatids separate into individual chromosomes and are pulled apart.

The fourth and last stage of mitosis is Telophase.

During this stage the chromosomes gather at opposite ends of the cell and lose their distinct rod-like shapes. Two new nuclear membranes then form around each of the two regions of DNA and the spindle fibers disappear.

The process that follows the last stage of mitosis is called Cytokinesis.

With two complete copies of the DNA now in two different regions of one cell, the cell membrane will pinch and divide the cytoplasm in half. The result is two individual cells that are identical to the original cell. Each of the two new cells have a complete copy of the DNA and contain all of the organelles that the original cell had.

Hopefully, this eases the problem for you and you understand it better.

Also, this image might help:

Let me know if you any other questions about this.

Good luck:)

4 0

4 years ago

This is an organism which feeds on, but usually does not kill, a larger organism.

Stells [14]

Answer:

Epiparasite is an organism which feeds on but usually does not kill a larger organism.

Explanation:

8 0

3 years ago

Read 2 more answers

Which option shows a reaction in which calcium carbonate (CaCO3) produces calcium oxide and carbon dioxide?

Yanka [14]

The reaction in which calcium carbonate produces calcium oxide and carbon dioxide is: CaCO3 = CaO + CO2. Thus, the third option is the right one.

The breaking down of calcium carbonate to calcium oxide and carbon dioxide is called DECOMPOSITION REACTION. A decomposition reaction is a type of reaction in which a single element is broken down into two or more elemental parts, which are less complex than the parent compound.There are three types of decomposition reaction, these are thermal, photo and electrolytic decomposition reactions.

8 0

4 years ago