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snow_tiger [21]
2 years ago
13

The first element of the periodic table is:

Biology
2 answers:
vitfil [10]2 years ago
3 0

Answer:

The anwser Is B:Hydrogen

sleet_krkn [62]2 years ago
3 0

Answer:

B) Hydrogen

Explanation:

hydrogen's atomic number is 1

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A student crested a model to show the flow of energy in a terrestrial ecosystem.
mario62 [17]

Answer:

In an ecosystem, energy enters in the form of solar energy or light energy from sun. Solar energy is transformed into various other types of energies like kinetic energy, chemical energy, potential energy, etc; but it eventually leaves the ecosystem in the form of heat energy.

3 0
2 years ago
As evidenced in the graph, the national average CO concentrations have decreased substantially over the years. All BUT ONE tacti
Gekata [30.6K]

Answer:

Explanation:

Carbon monoxide (CO) is a colourless, non-irritant, odourless and tasteless toxic gas. It is produced by the incomplete combustion of carbonaceous fuels such as wood, petrol, coal, natural gas and kerosene. Its molecular weight is 28.01 g/mol, melting point −205.1 °C, boiling point (at 760 mmHg) −191.5 °C (−312.7 °F), density 1.250 kg/m3 at 0 °C and 1 atm and 1.145 kg/m3 at 25 °C and 1 atm, and relative density (air = 1) 0.967 (1,2). Its solubility in water at 1 atm is 3.54 ml/100 ml at 0 °C, 2.14 ml/100 ml at 25 °C and 1.83 ml/100 ml at 37 °C.

The molecular weight of carbon monoxide is similar to that of air (28.01 vs approximately 29). It mixes freely with air in any proportion and moves with air via bulk transport. It is combustible, may serve as a fuel source and can form explosive mixtures with air. It reacts vigorously with oxygen, acetylene, chlorine, fluorine and nitrous oxide. Carbon monoxide is not detectable by humans either by sight, taste or smell. It is only slightly soluble in water, blood serum and plasma; in the human body, it reacts with haemoglobin to form carboxyhemoglobin (COHb).

The relationship of carbon monoxide exposure and the COHb concentration in blood can be modelled using the differential Coburn-Forster-Kane equation (3), which provides a good approximation to the COHb level at a steady level of inhaled exogenous carbon monoxide.

Conversion factors

At 760 mmHg and 20 °C, 1ppm = 1.165 mg/m3 and 1 mg/m3 = 0.858 ppm; at 25 °C, 1 ppm = 1.145 mg/m3 and 1 mg/m3 = 0.873 ppm.

8 0
3 years ago
Read 2 more answers
Describe the ecological services that grass performs in a hay field, on a golf course, or along the shoulder of a highway
Kruka [31]
I would say keep the soil from eroding and doesn't let it get dried out so fast.
4 0
3 years ago
Which statements about the fluid mosaic structure of a membrane are correct? Select the three correct statements.
jeka57 [31]

The correct statements are:

1. The framework of a membrane is a bilayer of phospholipids with their hydrophilic heads facing the aqueous environment inside and outside of the cell and their hydrophobic tails clustered in the center.

2. The diverse proteins found in and attached to membranes perform many important functions.

5. Because membranes are fluid, membrane proteins and phospholipids can drift about in the membrane.

6 0
3 years ago
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Which of the following contains the most freshwater? A. lakes
strojnjashka [21]

Answer:

D. Groundwater

hope this helps

6 0
3 years ago
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