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nirvana33 [79]
3 years ago
7

Describe a service that a ecosystem provides in your community that should be protected to ensure that the quality of the servic

e contains
Biology
1 answer:
ddd [48]3 years ago
8 0
In our community the ecosystem provides fresh drinking water via pipes called citywater or ground water. It should be protected well, because it is our cities only source of clean water, ''purified''.
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A sample of rock is found to contain 200 grams of a parent isotope.how many grams of the parent isotope will remain after one ha
emmasim [6.3K]

Answer: 100 grams of the parent isotope will remain after one half life.

Explanation:

Mass of the isotope present at initial stage = N_o=200 g

The mass of the parent isotope left after the time ,t=N

Time taken by the samle ,t = t_{\frac{1}{2}}

The half life of the sample :t_{\frac{1}{2}}

N=N_o\times e^{-\lambda t}

\lambda =\frac{0.693}{t_{\frac{1}{2}}}

\ln[N]=ln[N^o]-\frac{0.693}{t_{\frac{1}{2}}}\times t_{\frac{1}{2}}

2=\frac{[N_o]}{[N]}

[N]=\frac{N_o}{2}=\frac{200 g}{2}=100 g

100 grams of the parent isotope will remain after one half life.

5 0
3 years ago
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Define the term tissue & explain the concept of tissue culture.​
Rudik [331]

Tissues are a group of specialised cells with a common structure, origin and function. For example - epithelial tissue, nervous tissue, muscle tissue.

Plant tissue culture is a practice of propagating plants under sterile conditions, often to produce clones of a plant. Process of tissue culture: A small part of the plant is allowed to grow on a nutrient medium containing all nutrients and hormones necessary for the plant growth

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4 0
2 years ago
The order Cetacea includes modern-day whales, dolphins, and porpoises. These marine mammals share common characteristics that ha
SVETLANKA909090 [29]

Answer:

The correct option is A. they evolved from land mammals.

Explanation:

Evolution can be described as a process through which organisms in a species change over a period of time due to the natural selection of the environment. Those organisms that have many similarities in their functions or structures are considered closer to one another and have the same common ancestors.

The properties mentioned in the question about cetaceans resembles the properties of land mammals. For example, cetaceans lack gills and breathe air. Land mammals also do not have gills and need to respire for living. The cetaceans have fin bones which are similar to the limb bones in the land mammals. Hence, these observations show that cetaceas have evolved from land mammals.

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3 years ago
-¿Qué órganos son los responsables del sentido del olfato y del gusto?
Nat2105 [25]

Answer:

Olfato- Fosas nasales

Gusto- Lengua

Explanation:

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3 years ago
Auxins _____.
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I believe auxins are used for fast growth in of the stem(shoot), retention of fruits, it induces flowering
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3 years ago
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