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MatroZZZ [7]
2 years ago
12

One effect of the pesticide ddt upon birds is to inhibit the production of the enzyme carbonic anhydrase, which controls calcium

metabolism. it is believed that this causes eggshells to be thinner and weaker than normal and makes the eggs more prone to breakage. an experiment was conducted where 16 sparrow hawks were fed a mixture of 3 ppm dieldrin and 15 ppm ddt (a combination often found in contaminated prey). the first egg laid by each bird was measured, and the mean shell thickness was found to be 0.19 mm. a "normal" eggshell has a mean thickness of 0.2 mm. the null and alternative hypotheses are
Biology
1 answer:
pav-90 [236]2 years ago
7 0

<u>Answer</u>:

The null hypothesis: the mean egg thickness is 0.2 mm H_{0} =0.2

The alternative hypothesis: the mean egg thickness is less than 0.2 mm H_{1}

In statistics, the null hypothesis states that there is no significant difference between the observed value and the mean thickness. The alternative hypothesis states is the opposite and states the scientist's "idea" behind the experiment. Here, it refers to the fact that due to DDT, the egg shell will be thinner compared to the mean value.

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I believe A:Both have reproductive cells with flagella
3 0
3 years ago
Eric has blood type O. What could be the genotype of his grandmother Tricia? Select all that apply.
sleet_krkn [62]

Answer:

C. IBIB

D. IBiO

Explanation:

The blood group system comprises of three different kind of alleles, iA, iB, IO. As we know that a person gets two alleles for both traits, one from father and one from mother, and based on that a person gets its blood group. IA and IB are dominant to IO.

So, if a person has genotype IAIO he will have blood group A and if he has genotype IOIB he will have blood group B because A or B are dominant to O.

However, if a person has blood group O it means that he has genotype IOIO.

So, in this diagram we see that Eric has blood type O, which means that his genotype will be IOIO.

The Eric's mother Melissa has blood group B, which means that she can either had genotype IOIB and IBIB respectively.

Similarly, Eric's grandmother Tricia has genotype  B which means that she can have genotype both  IOIB and IBIB respectively.

Therefore, both C and D are correct options.

3 0
3 years ago
During energy conversions, some energy is always lost as
sattari [20]
Correct answer - Heat Energy.

Why? - In every energy transfer, some amount of energy is lost in a form that is unusable. In most cases, this form is heat energy.
8 0
2 years ago
Read 2 more answers
Which of these organisms are the most closely related remember the name of an organism is in the form Genus species
Damm [24]

Missing options:

A) Nerodia spedon and Nerodia fasciata

B) Eudocimus albus and Ardea albus

C) Egretta thula and Platalea ajaja

D) Pituphis melanoleucus and Thamnophis proximus

Answer:

A) Nerodia spedon and Nerodia fasciata

Explanation:

Phylogenetically, the closer relatives share same ancestor and therefore same clad in phylogenetic tree. In the given options, Nerodia spedon and Nerodia fasciata share same genus name so they are closer relatives. If we go further about their characteristics, they are two types of water snakes that are found in north and south America. They both are also non-venomous.

On the other hand, remaining options are not correct because none of the mentioned organisms share same genus name and belong to different positions in the phylogenetic tree.

5 0
3 years ago
Read 2 more answers
PLEASE HELP MEH!!!! I CAN"T FIGURE THIS ONE OUT!!!!!
SashulF [63]
The answer is y = 1.2x + 2

x - the number of weeks
The equation is:    y = ax + b

He started the project when the plant was 2 in.
x = 0  (at the beginning, there were 0 weeks)
y = 2
y = ax + b
2 = a * 0 + b
2 = 0 + b
b = 2

<span>At week 5, the plant was 8 in. 
x = 5
y = 8
b = 2

y = ax + b
8 = a * 5 + 2
8 = 5a + 2
8 - 2 = 5a
6 = 5a
a = 6/5 = 12/10 = 1.2

The equation is:
y = 1.2x + 2

</span>
3 0
2 years ago
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