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2 years ago

Approximately _____ elements occur naturally on earth.

2 answers:

8 0

Answer: Till date 118 elements have been approximately 94 elements occur naturally on earth. Though some of the elements are present in very small quantities. The rest of the 24 elements in the periodic table are synthetic elements. There are almost 80 elements that have a stable isotope and 38 elements have radionucleides which means that they decay over a period of time.

FromTheMoon [43]2 years ago

3 0

<span>Of the 118 elements that have been discovered, 90 of them indisputably occur in nature. There is disagreement over whether four more or eight more occur naturally as a result of radioactive decay of other natural elements. The answer is, therefore, 94 or 98.</span>

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What is the abbreviation for the medical condition in which multiple follicular cysts form in both ovaries?

irga5000 [103]

Answer:

PCOS

Explanation:

PCOS stands for polycystic ovarian syndrome. PCOS is a condition in which the ovaries have multiple follicles that do not ovulate to release an egg due to hormonal disturbances. it is a common cause of infertility.

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2 years ago

When you bring any of your fingers in contact with your thumb, this movement is called __________.when you bring any of your fin

vladimir2022 [97]

Answer:

Opposition

Explanation:

Opposition is the type of movement that is only for the hands. Opposition is them movement where you bring your finger/s in contact with your thumb. When you put it back to its anatomical position, which is beside the index finger (pointing finger) this is called <em>reposition.</em>

Retraction occurs in the scapula (Shoulder blades) and mandible (jaw). Dorsiflexion you see that happen in your foot. When you bring your toes closer to the shin. Supination is more on the forearm and foot, where you rotate it so your palms are facing forward (sole facing the other ankle for feet). Flexion is the movement of body parts where you bring them closer to each other at a joint (the angle between the two parts are lessened). Like when you bend your elbows to "flex" muscles.

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2 years ago

10.The bacteria that are capable of converting the atmosphere nitrogen into nitrates and nitrites

kotykmax [81]

It is b your welcome

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2 years ago

Question 7: What might be some implications of Robert Hazen’s experiments

Angelina_Jolie [31]

Answer:

Robert Hazen’s studied enviromental and biological processes that might have been critical for life, and also for the formation of approximately two-thirds of Earth's mineral species (see Hazen et al., 2008; Gonzalez & Richards 2020) .

Explanation:

Hazen provided evidence about how first organic molecules were generated on the primitive earth millions of years ago. He observed that high-pressure hydrothermal vents may provide food for underwater ecosystems. It represents a piece of critical evidence on the origin of life.

You can read these articles that are certainly clarifying in the description of his experiments and discoveries:

1- Hazen, R. M., Papineau, D., Bleeker, W., Downs, R. T., Ferry, J. M., McCoy, T. J., ... & Yang, H. (2008). Mineral evolution. American Mineralogist, 93(11-12), 1693-1720.

2- Gonzalez, G., & Richards, J. W. (2020). The privileged planet: how our place in the cosmos is designed for discovery. Gateway Editions.

6 0

2 years ago

In human body how many types of DNA r ther

zavuch27 [327]

Answer:

24 chromosomes

Explanation:

The Human Genome Is Composed of 24 Different Types of DNA Molecules. Human DNA is packaged into physically separate units called chromosomes.

7 0

1 year ago

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