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guajiro [1.7K]
3 years ago
13

An experiment that does not have a positive AND a negative control is a poorly designed experiment

Biology
1 answer:
Lina20 [59]3 years ago
4 0

Answer:

true

Explanation:

you frequently need a control which shows the experiments to stay the same. controls are very important.

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When organisms move away from population, it it called
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3 years ago
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In tomatoes, two alleles of onegene determines whether the plant has purple (P) or green (G) stems, and a separate, independent
Degger [83]

Answer:

The correct answer will be G/G ; P/p x g/g ; P/p

Explanation:

Let G be the dominant allele for stem color and g be the recessive allele for stem color. Let P be the dominant allele for leave shape and p be the recessive allele for leave shape.

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3 years ago
A marine ecologist counts the number of crabs in three different intertidal regions that are each two hectares. The crab counts
romanna [79]

Answer:

Density is nearly 3 cabs per hectare

Explanation:

Given -

There are three three intertidal regions.

Area of each intertidal region is 2 hectares.

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Intertidal region I - 7

Intertidal region I - 2

Intertidal region I - 6

Sum of crabs in all three regions is equal to

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Total area of all three intertidal regions is equal to

2 + 2+ 2\\= 6 hectares

Now density per hectare is equal to total population of crab divided by total area of all the three intertidal regions

Density = \frac{15}{6} \\= 2.5

Density is nearly 3 cabs per hectare

5 0
3 years ago
Which of the following would you least likely find living in the chaparral biome?
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B. Pine trees, this is the answer that was right after I took the test XD

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Which of the following results from a mark-recapture study done on mice would reflect a larger population size? When taking the
Lubov Fominskaja [6]

Answer:

Option (3).

Explanation:

Mark recapture method is used for the estimation of population size of an area. The individuals are identified by  some mark on them. The formula of mark recapture method is

N = M * C/ R

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The individual with 200 population, 20 are marked for the first time represent the large population size.

Thus, the correct answer is option (3).

6 0
3 years ago
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