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Sergio039 [100]
3 years ago
14

Why do cells need a selectively permeable barrier?

Biology
2 answers:
Alja [10]3 years ago
8 0
Well so only good stuff goes in and only bad stuff comes out.
eduard3 years ago
6 0
Using a selectively permeable membrane, a cell can make sure that no harmful materials enter the cell while still obtaining nutrients from its environment. If a cell did not have a selectively permeable membrane, malignant materials could enter the cell and damage or destroy it or even make it cancerous. If it didn't have a selectively permeable membrane it would also have no way of separating its own components from the environmental components around it.
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15. Brown eyes (B) are dominant over blue eyes (b).
svlad2 [7]

Both parents have Bb Bb

      B        b

B     BB     Bb

b     Bb     bb

The child got little b, little b

3 0
3 years ago
Assume there is a certain population of fish in a pond whose growth is described by the logistic equation. It is estimated that
eimsori [14]

Answer:

The correct answer is  p1 = 898 and p2 = 1020.

Explanation:

This is a logistic growth problem and will utilize the following formula:  

Pn = P_{n-1} + r (1- \frac{P_{n-1} }{k} ) P_{n-1}

Given ;

r = 1.7

k = 1500

Po = 400

then,

Pn = 400 + 1.7 (1- \frac{400 }{1500} ) 400

= 400 + 1.7 (293)

= 400+ 498

P₁= 898

Similarly,

P₂= P_{2-1} + r (1- \frac{P_{2-1} }{k} ) P_{2-1}

= Pn = 400 + 1.7 (1- \frac{898 }{1500} ) 400

= 1020

Thus, the correct answer is  p1 = 898 and p2 = 1020.

7 0
4 years ago
Samuel is interested in taking a vitamin supplement. about what percentage of u.s. adults regularly take a vitamin-mineral suppl
zzz [600]

The majority of U.S. adults—68 percent—take dietary supplements and consumer confidence remains high, with 84 percent of U.S.

Hope it helps!


4 0
3 years ago
What causes earthquakes?
Paladinen [302]
Seismic Waves in Earth cause earthquakes. Tectonic Plates can also cause earthquakes as they move against each other
8 0
3 years ago
Artichokes, olives and almonds can only be produced in the ________ biome. mediterranean tropical savanna tropical rain forest m
Radda [10]
The 3 can only be produced in the Mediterranean biome. This biome is known to have dry and wet weather. However, the summer seasons in this biome is very dry and usually lasts longer. Hence, the vegetation is found to be drought resistant. The 3 plants mentioned are known to be naturally drought resistant, hence it is in this biome that it thrives and survives best.
8 0
4 years ago
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