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3 years ago

20 points and brainliest!! I NEED HELP!

Biology

2 answers:

mars1129 [50]3 years ago

8 0

C. Hydrogen, oxygen

Hope this helps!

skad [1K]3 years ago

7 0

C Hydrogen, oxygen

A watermolecule has three atoms: two hydrogen (H) atoms and one oxygen (O) atom.

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Where do most of the world's coal mines come from?

Sonja [21]

Answer:

Most of the world's coal mines come from China, India, the United States, the European Union, and Australia.

Explanation:

China: In the year 2018, China alone produced approximately 3523 million tonnes of coal. Though China is the largest producer of coal in the world, it has to import coal from other countries to fulfill its energy needs. China's share in the total coal produced in the world in the last 12 years is 39.7%.
India: The production of coal in India reached approximately 716 million tonnes in the year 2018. The total amount of coal produced in India in the last 12 years makes up 7.5% of the coal produced all over the world.
The United States: The coal produced in the United States in the year 2018 was approximately 702 million tonnes. The last 12 year share of the coal produced in the US is 16.2% of the total coal produced all over the world.
The European Union: The countries that constitute the European Union togetherly produced approximately 490 million tonnes of coal in the year 2018. The last 12-year contribution of the EU to the total coal produced in the world is 9.2%.
Australia: The production of coal in Australia for the year 2018 was approximately 481 million tonnes. Australia alone produced 6.2% coal of the total world production of coal in the last 12 years.

6 0

3 years ago

While primary production refers to the synthesis of plant material, secondary productivity refers to the synthesis of _____.

Westkost [7]

ecosystems

An ecosystem involves both the biological (plants, animals, human beings) and non-biological (land, water, soil, and atmosphere) community which interacts as a system. More importantly, the living things are very dependent on the abiotic community since it cannot survive by itself. Every animal, plant and human needs the primary physiological needs of water, food and shelter provided by the abiotic system.

6 0

3 years ago

Which of the following is not one of the three main periods of Greek sculpture?

Natasha_Volkova [10]

I believe the correct answer is option D. Corinthian is not one of the three main periods of Greek sculpture. Instead, it is Archaic, Classical and Hellenistic that are the main periods. Corinthian is the last developed of the three principal classical orders of ancient Greek and Roman architecture.

7 0

3 years ago

Read 2 more answers

Nuclei with an _____________ number of protons and neutrons possess a property called spin. Nuclear spin can be thought as eithe

andriy [413]

Answer:

Explanation:

$\text{We are to fill in the blanks with the correct words that best suit the blanks}$

$\text{Nuclei with an} \ \mathbf{odd} \ \text{number of protons and neutrons possess a property }$

$\text{called spin. Nuclear spin can be thought as either up or down with the spin }$

$\mathbf{magnetic \ field.}$

$\text{When a molecule is placed in an NMR, a large} \ \mathbf{magnetic} \ \text{field is applied making the }$ $\text{spin states become of unequal energy, with the spin that generates a magnetic field }$ $\text{in the same direction of the applied magnetic field being}\ \mathbf{ lower} \ \text{ in energy. The NMR }$ $\text{then uses} \ \mathbf{ radio \ frequency}\ \text{ to 'flip the spin' of each nuclei, wherein each nuclei will }$ $\text{require a specific energy level of radiation that corresponds to its difference in }$ $\text{energy of spin states, this is often called the nuclei's}\ \ \mathbf{resonance } \ \text{frequency, }$ $\text{which is measured by the NMR and translated to teh final spectra.}$

7 0

3 years ago

In a population of panthers, there are 60 black panthers, 30 pink panthers, and 10 white panthers. PP is produces black, Pp prod

Olin [163]

Answer:

0.25

Explanation:

The population of panthers consists of 60 black panthers with the dominanat allele PP. 30 are pink panthers with the genotype Pp and 10 panthers are white with the phenotype pp.

The frequency of p allele in the population can be determined by

the number of individual with pp genotype + 1/2the number of individual with Pp genotype divided by the total number of individual.

Frequency = 10+1/2*30/100

Frequency = 0.25.

Thus, the frequency of p genotype is 0.25.

8 0

3 years ago