50 points / will mark brainliest if answered quickly!

1. list three density-dependent factors and three density-independent factors that can limit a population's growth.

2. what is the relationship between competition and population size?

3. give an example of a density-independent limiting factor that has affected a human population. describe how this factor changed the human population.

4. describe the long-term effects of competition on populations of two different species competing for the same resources.

5. how do parasites serve as a density-dependent factor?

6. how can you account for the fact that the human population has grown more rapidly during the past 500 years than throughout it's previous history?

7. how does the age structure of a population affect it's growth rate?

8. explain how a limited resource can affect the survival of a species. give a specific example.
9. what does density depend on?

1. density-dependent factors - competition, predation, parasitism, and    disease.

density-independent factors- natural disasters, seasonal cycles, unusual weather, and human activity

2.

As populations increase in size, completion increase as well. For example more people more food demands. as populations become larger and more and more crowded people compete for food, water, sunlight, spaces to live and so on.

3.

Example:

A prolonged drought, with its associated crop loss could cause deaths, financial hardship, and emigration to other areas.

4.

both are under pressure to change in ways that reduce competition, may evolve to occupy different niches

5.

parasites take nourishment from a host - weakening it / killing it

6.

favorable conditions: agriculture, medicine, industry, sanitation

7.

It equal age distribution = very slow, steady growth

large % of children and teenagers = very rapid growth

8.

the recourse may be a part of a organism's niche/habitat (ex. panda and bamboo)

9.

Density (d) depends upon the mass (m) and volume (v) of a substance. The mass depends upon the amount of matter in a substance, whereas volume is the amount of space that a substance takes up.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).