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Rina8888 [55]
3 years ago
6

The temperate grasslands, also called prairie, feature hot summers and cold winters. Rainfall is uncertain and drought is common

. The temperate grasslands usually receive about 10 to 30 inches of precipitation per year. The soil is rich in organic matter because the above-ground portions of grasses die off annually, enriching the soil. The area is well-suited to agriculture, and few original prairies survive today. All but one adaptation would help grasses survive grazing and other disruptions. Identify that adaptation. A) Grasses grow from near their base. B) Prairie grasses have narrow leaves. C) Prairie grasses have extensive root systems. D) Grass roots survive even when above ground parts a destroyed by fire.
Biology
1 answer:
weeeeeb [17]3 years ago
8 0
B) Prairie grasses have narrow leaves.

Took the quiz it's right.
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A pharmacist has two vitamin-supplement powders. The first powder is 10% vitamin B1 and 30% vitamin B2. The second is 15% vitami
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Answer:

560 mg of powder 1 and 160 mg of powder 2

Explanation:

Let "X" denotes weight of powder 1 added to the new mixture and  "Y" denotes weight of powder 2 added to the new mixture

Total weight of vitamin B1 in the mixture is equal to 80 mg

Total weight of vitamin B2 in the mixture is equal to 200 mg

Equation 1

0.1 X + 0.15 Y= 80

Equation 2

0.3 X + 0.2 Y= 200

Let us simplify the above two equations, we will get

10 X + 15 Y = 8000\\3X + 2Y = 2000

2 (10 X + 15 Y = 8000), 20X + 30 Y = 1600015(3X + 2Y = 2000), 45X +30Y = 30000\\25 X = 14000\\X = 560

Substituting value of X in equation 2 we get

0.3 * 560 + 0.2 Y = 200\\0.2 Y = 200 - 168\\Y = 160

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A mutation in which all or part of a chromosome
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