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densk [106]
3 years ago
13

Loretta and her friends want to find out which of their pets can run the fastest. Which kind of scientific investigation should

they use?
A.

a controlled experiment

B.

development of a model

C.

a review of existing work
Biology
1 answer:
antiseptic1488 [7]3 years ago
3 0
They should do A, a controlled experiment
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If the distance between two objects is increased to four times the original distance, how will that increase change the force of
bija089 [108]
Gravitational force becomes sixteen times lesser. The strength of the gravitational force between two objects is dependent on their mass. Gravitational force will be weaker if the objects move further away from each other.
This was used to solve for the gravitational force,
G = gravitational constant 
m = mass of the first object 
M = mass of the second object 
<span>d = distance between the two objects 
</span>
[G * (m*M) / 16d^2] = 1/16
3 0
3 years ago
The passing of __________________ is the basis of heredity. 2. our ________________ encode the instructions that define our trai
cluponka [151]
1. The passing of traits from parents to the offsprings (children) is the basis of heredity. Traits are notable features or qualities in a person, such that each individual has a different combination of traits that makes us unique from others. They are inherited from our parents and passed from generation to generation. That is to our children, then our children to their children and so on.

2. Our genes encode the instructions that define our traits. Traits are majorly defined by the instructions encoded in the genes. However, environment may influences the traits and may play an important role in shaping the traits we posses. Often times these traits may be changed by the environmental factors.

3. Each of us has thousands of genes, which are made of DNA molecules and reside in our chromosomes. Genes are functional or fundamental units of heredity. They are made up of DNA molecules, and act as instructions to make proteins, through a process of transcription and translation. Transcription involves formation of a messenger RNA which then undergoes translation in the cytoplasm to make proteins.The protein formed determine the traits of an individual.

4. In addition to our genes, the Environment we live in also helps define our traits. The expression of genes in organisms may be influenced by environmental factors, these includes the external factors where the organism lives or develops, and also the internal factors such as its hormones and metabolism.

5. Human have two complete sets of 23 chromosomes.  A human being has a total of 46 chromosomes (23×2 = 46). This is referred to as a diploid number (2n). Each set is considered to be a one homologous chromosome set. This is the case of of the somatic cells or the body cells which represents a diploid number of chromosomes.

6. When parents conceive a child, each parent contributes one set of chromosomes.This enhances the passing of traits or genes to the child. The egg cell or the ovum from the mother and the sperm cell from the father contain the haploid number (n) or one set of chromosome. During conception the two combines/fuse to form a zygote which is now diploid (2n).

7. Every child receives half of its chromosomes from the mother and another half from the father. During meiosis in the gametes for both mother and father a haploid cell is formed with one set of chromosomes (haploid, n). Therefore, each child contains half number of chromosomes from the mother and the other half from the father making up the diploid number (2n).

8. This transfer takes place at conception, when the father's sperm joins the mother's egg. During conception, fertilization takes place and the sperm cell fuses with the mother cell (ovum) forming a single cell called Zygote. The zygote has the two sets of chromosomes (23 +23 = 46). The cells then divide by mitosis leading to the development of a child.

9. While most cells in our bodies have two sets of chromosomes, or a total of 46 chromosomes, egg and sperm each have 23 chromosomes. The body cells (somatic cells) contain two sets of chromosomes (diploid number, 2n) from mitosis, while the gametes have a single set of chromosomes (haploid, n), from meiosis.
5 0
3 years ago
Which is not a characteristic of ribosomes
Karo-lina-s [1.5K]

"They are made of DNA. Ribosomes are cellular components that manufacture proteins from amino acids but they are NOT made of DNA."

Hope helps!-Aparri

7 0
2 years ago
What is the name given to the original cell before it divides?
Karolina [17]
The name given to the original cell before it divides is called the parent cell.
3 0
2 years ago
One level of organization of life (i.e., an emergent property) is a collection of similar individual organisms that could interb
IrinaVladis [17]

Answer: Specie

Explanation:

The basic unit of classification of living things is species. species is the smallest unit containing members which have the largest number of features in common and usually interbreed among themselves.

Thus, the group of deer describes a specie since they can interbreed freely and are similar in characteristic features.

6 0
3 years ago
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