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lakkis [162]
2 years ago
6

Five hundred cockroaches of one species were sprayed with a new insecticide. Twenty-four hours later nearly all the cockroaches

were dead. A few, however, survived. This outcome illustrates which one of darwin’s key ideas about natural selection and variation?.
Biology
1 answer:
prisoha [69]2 years ago
7 0

Answer:

This shows that over time, some insects can become "pesticide-resistant" meaning that pesticides don't affect them anymore. And this only happens every few generations. Therefore, each generation is being naturally selected and accumulating variations that make them resist the chemicals. This shows that each cockroach's genes are changing to give them variation from the rest of the population.

I hope this helps!

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Write a brief report about what causes cancer cells to develop.
a_sh-v [17]
In order to study the formation of cancer cells, you should study the life cycle of normal cells as cancer cells are abnormal cells. 

Actually, Normal cells grow, divides and died after an interval of time. And when this process is break down, cancer cells begin to form. They are usually old cells which don't die after their life cycle.

Hope this helps!
8 0
3 years ago
Result of succession that involves relative stability and species diversity
seropon [69]
Soil creation is a result of carrying out successions. Succession is the process in which land that is inhabitable by organisms is reclaimed and made fertile. This is done using pioneer species, which do not require soil to grow. After a while, these species are removed and a secondary succession is carried out. After this process, soil is created and the land becomes fertile.
5 0
3 years ago
What is the
lara31 [8.8K]

Answer:

Current Air Temperature

The current air temperature plotted to the nearest whole degree Fahrenheit.

Dew Point Temperature

The dew point temperature plotted to the nearest whole degree Fahrenheit.

Sky Cover

The total amount of clouds in tenth. Plotted in the station circle according the the following table.

Wind Speed And Direction

The wind direction is plotted as the shaft of an arrow extending from the station circle toward the direction from which the wind is blowing. The wind speed is plotted as feathers and half-feathers representing 10 and 5 knots, on the shaft on the wind direction arrow. See the following table.

Visibility

The visibility plotted in fractions of a mile. For values above 10 miles, the values are omitted from the map.

Sea Level Pressure

The barometric pressure in tenths of millibars reduced to sea level. The initial 9 or 10 and the decimal points are omitted.

ex: plotted = 982, actual = 998.2 mb

ex: plotted = 012, actual = 1001.2 mb

Pressure Tendency

The pressure change in the past 3 hours preceding the observation. Plotted to the nearest tenth of a millibar. The plotted symbol characterizes the change in pressure according to the below chart.

6 0
3 years ago
during any type of mineral growth, atoms accumlate on___? A.ions B.native elements C.silicates D.crystal faces
marshall27 [118]

Answer:

D.crystal faces

Explanation:

4 0
3 years ago
Based on the demonstration and your microscopic investigation, which of the three solutions is hypotonic to the red blood cells?
r-ruslan [8.4K]

You have given no demonstration based on your microscopic investigation so I cant tell you the answer to the question. I will try to help you by elaborating how to decipher..

Three terms hypotonic, hypertonic and isotonic are used when referring to two solutions separated by a selectively permeable membrane.

The hypertonic solution has a great concentration of OAS than the solution on the other side of the membrane. It is described, therefore, as having a great osmolarity. The hypotonic solution has a lower concentration of OAS, or osmolarity, than the solution on the other side of the membrane. When the two solutions are at an equilibrium, the concentration of OAS being equal on both sides of the membrane, the osmolarities are equal and are said to be isotonic.

The net flow of water is from the hypotonic to the hypertonic solution. When the solutions are isotonic, there is no net flow of water across the membrane.

If red blood cells are placed in a solution with a lower solute concentration than is found in the cells, water moves into the cells by osmosis, causing the cells to swell; such a solution is hypotonic to the cells.

So, look at the information and data you have on your microscopic investigation and use these guidelines to tell you which is which.
6 0
3 years ago
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