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mel-nik [20]
3 years ago
6

Whales are thought to have evolved from land animals similar to large otters. As evidence of this, whales have useless leg bones

(structure C) that float inside their bodies. These leg bones are ___________ structures.
Biology
1 answer:
Dennis_Churaev [7]3 years ago
3 0
These leg bones Vestigial structures
Vestigial structures are structures we have, but don't use.
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As a puppy, Cricket weighed 334 pounds. At her 1-year check-up with the vet, Cricket weighed 12.5 pounds.
Stella [2.4K]

The weight gained by Cricket within the 1-year period would be 8.75 or 8 3/4 pounds.

  • Cricket weighed 3 3/4 pounds initially and 12.5 pounds after one year.

  • In order to calculate the weight gained within the said period, the initial weight would be subtracted from the final weight.

Thus:

Weight gained = 12.5 - 3 3/4

                         = 12.5 - 3.75 or 12 1/2 - 3 3/4

                            =  8.75 or 8 3/4

More on subtraction operation can be found here: brainly.com/question/213283?referrer=searchResults

5 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 best describes the relationship of the embryo and the fetus
Reil [10]
A baby isn't considered a fetus until about 8 to 9 weeks after conception. During those first weeks, the baby is considered as the embryo. The embryo is the development of the pregnancy until about 9 weeks, it will then turn into a fetus.
5 0
3 years ago
The chemical equation shown represents photosynthesis.
ladessa [460]

Answer: The role of substance A in photosynthesis is: it combines with water to form glucose.

Explanation:

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2 years ago
Is serine a natural occurring molecule, why or why not? Why is serine chemical and physical properties? How does serine properti
choli [55]
Hmmm im reallt not sure this pretty hard im stuck i need help!
6 0
2 years ago
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