1. A pure substance has alan composition. 2. A/An is composed of two or more types of matter that can be present in varying amounts. 3. A solution is a/an mixture. 4. A mixture that is no uniform throughout is a/an mixture. 5. A pure substance that cannot be broken down chemically is a/an 6. A characteristic of matter that’s not associated with a change in it’s chemical composition is known as a/an property. 7. Wax melting is an example of a/an change in the state of matter. 8. A banana peel turning brown is an example of a/an change in the state of matter

Explanation:

1. A pure substance has a definite composition.

Matter can be classified as pure and impure substances. Pure substances are distinct substances having very definite composition and homogeneous throughout.

2. A mixture is composed of two or more types of matter that can be present in varying amounts.

Mixtures are impure substances that are made up of indefinite composition with their constituents retaining their identities.

3. A solution is a homogeneous mixture.

A solution is a homogeneous mixture made up of solutes dissolved in a solvent. The solute is the substance being dissolved. The solvent is the dissolving medium.

4. A mixture that is no uniform throughout is a heterogeneous mixture.

Heterogeneous mixtures are not uniform all through. They have their constituents in different phases.

5. A pure substance that cannot be broken down chemically is an element.

An element is a distinct substance that cannot be split-up into simpler substances. Such substances are made up of only one kind of atom.

6. A characteristic of matter that’s not associated with a change in it’s chemical composition is known as a physical property.

The physical property of matter tells us everything about it when no change is occurring to its constituent. They are usually observed with our senses or instruments or pieces of apparatus.

7. Wax melting is an example of a physical change in the state of matter.

Physical change is one that alters the physical property of matter especially the form and state.

Melting of wax is a phase change from solid to liquid. It is a reversible process.

8. A banana peel turning brown is an example of chemical change in the state of matter.

Chemical change is a change that alters the chemical properties of matter. Here, new kind of matter is produced.

The browning of banana peel due to spoilage is a chemical process. We cannot reverse this process.

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

explanation:

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prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.