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Fittoniya [83]
3 years ago
11

A(n) _______ is a pure substance that can't be broken down into simpler substances by chemical or physical means.

Biology
1 answer:
Rasek [7]3 years ago
6 0
You don't have the options to choose from but I believe from past experience the answer to the question is element. 
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Why is variety in crop plants important for food security?
aev [14]

Answer:

Disease and Famine

Explanation:

If there is a disease that affects a type of plant, having other types of crops to rely on could save one from starvation. Also, only planting one crop in an area can change the pH and nitrogen levels in negative ways, so that eventually no plants can grow there. Not to mention the obvious balanced diet needed for a healthy body.

4 0
3 years ago
Cultures of a bacterial species were incubated on the shelf of a refrigerator, out on a lab bench top, on the shelf of a 37°C in
Oksana_A [137]

Answer:

D. Psychrophile

Explanation:

Psychrophiles or cryophiles are a type of extremophiles i.e. they live in extreme environment. They grow well in low temperatures ranging from -20 to +10 degree Celsius.

Here, the bacteria was incubated at different temperatures. It did not show growth at standard incubation temperature of 37°C which indicates that it might be an extremophile preferring either very hot or very cold environment. But it also did not show growth at 50°C which means that it does not survive well at high temperature.

Lab bench top has generally colder surface compared to the surrounding environment and a little growth was observed there which indicates that this bacteria might require cold temperature for growth. The result was finally confirmed with abundant growth observed inside refrigerator which is only possible if it is a psychrophile.

7 0
3 years ago
Which factor would affect photosynthesis the least? amount of carbon dioxide in the air nitrates in the soil amount of light ava
Elenna [48]
The factor that would least affect photosynthesis is Nitrates in the soil.
Photosynthesis is the process by which plant make their own food by utilizing energy from sunlight, water and carbon dioxide. The limiting factors that affect photosynthesis are the light intensity, carbon dioxide concentration, temperature and water. Without enough light, a plant cannot photosynthesize very quickly, even if there is plenty of water and carbon dioxide. 
3 0
3 years ago
Please Help!!!!!!!!!!!!!!!!!!!!!!!!!!
Nana76 [90]

Answer:

PP, Pp

Explanation:

Use your finger to cross the two figures on the outside parts of the Punnett Square; there are only two options.

Those are your answers.

Hope this helps.

-Gumina

6 0
4 years ago
Que conocimientos tiene sobre el ADN?
Strike441 [17]

Answer:

El conocimiento del ADN, su estructura y función, fue determinante para el desarrollo de la biotecnología moderna. ... Es decir que el ADN de un ser humano puede ser “leído” dentro de una bacteria, y una planta puede interpretar la información genética de otra planta diferente.

Explanation:

5 0
3 years ago
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