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Feliz [49]
3 years ago
14

What are chemicle bonds

Biology
1 answer:
Pani-rosa [81]3 years ago
3 0

Answer:

Chemical bonds are temporary connections between molecules that hold two or more molecules together. Types of chemical bonds including covalent, ionic, and hydrogen bonds. Chemical bonds enable chemical compounds to be formed. Chemical bonds are essential to all life.

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Investigator Benton uses several methods to analyze hair samples found at the crime scene. He examines the physical features of
Diano4ka-milaya [45]

Answer:

Medulla.

By analyzing the DNA extracted from the hair follicle, the medullary index and the pattern of medulla in the hair samples obtained from a crime scene, an investigator can identify the owner.

Explanation:

The hair consists of follicle and shaft. The follicle is the part of the skin, where the hair grows and the hair shaft has three layers: an inner medulla,  a cortex, and an outer cuticle.

The morphology (physical characteristics) of hair provides a broad detail on the racial background of  an individual and an investigator can identify a  group of people who share similar  traits. But the hair without follicle cells attached to it, cannot  be used to identify a specific individual. If the follicle of a hair is present, then it can lead to individual identification by DNA analysis. Also the medulla of animals is larger than that in the humans. By comparing the medullary index (the ratio of the diameter of the medulla to the diameter of the entire  hair), it can be determined if the hair obtained from crime scene belongs to animals or humans. The macroscopic (length, color, and curliness) and  microscopic characteristics ( pattern of the medulla, pigmentation of  the cortex, and types of scales on the cuticle) of the hair samples are studied during a crime investigation. If the entire hair follicle (follicular tag) is present in the hair samples found at the crime scene, the blood and tissue attached to  the follicle is extracted and analyzed using DNA profiling. DNA analysis of the hair follicle provides  an identification with greater accuracy than the hair shaft.

6 0
3 years ago
Why do people feel fireworks before hearing it?
mars1129 [50]

Answer:

People feel fireworks before hearing it because light travels faster than sound.

Explanation:

We always see the colors of the fireworks before hearing their defeaning sounds. This is because light travels faster than sound, so we can see the light before hearing the sound. An example of this is seeing lightning before hearing thunder. When lightning strikes, the air around it moves very quickly, causing vibrations.

<em>Hope this helps!</em>

<em />

<em>xoxo,</em>

<em />

<em>cafeology</em>

4 0
2 years ago
Why is Biólogy hard ?
andrey2020 [161]
Well thats ur opinion some people might not think it is hard
7 0
3 years ago
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2. What causes acid rain?
Zigmanuir [339]
I think it’s the first one
5 0
3 years ago
Vegetable crops growing on a commercial farm are damged by an unkown disease or pest with a 70 to 90 percent mortailty rate. The
Alexxandr [17]

Answer:

soil and vegetative matter screening for soil structure integrity and invasive pathogens

Explanation:

Repeated use of fertilizer causes the soil to break down and lose it nutrient capacity. This in turn will affect the integrity of the plants, now in a nutrient deficit environment. In addition to this, soil micro-biome environment may also be compromised once soil structure and nutrient is lost. Some of the bacteria, fungi and protozoan in the soil plays a role in defense against invasive pathogens. When this is lost the possibility for infection and increased risk of unknown pest and disease is imminent.

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3 years ago
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