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4 years ago

Which of the following is a true statement about hypotheses?

Biology

2 answers:

mylen [45]4 years ago

7 0

Answer: B. Data collected during scientific investigations must always support hypotheses.

Explanation:

Hypothesis is a statement which is based upon few evidences and facts which is used to assume the cause of a natural phenomena or anything else. The hypothesis can be rejected or accepted on the basis of the experimental process. That is if the results of the experimental process does not match with the hypothesis then the hypothesis can be rejected otherwise accepted.

The data obtain from the scientific investigation must prove the statement of the hypothesis. This will propose the fact that the assumption of the researcher is correct and forms the basis of new research and innovation.

Nat2105 [25]4 years ago

4 0

I believe it is A. because hypothesis is an eduated guess, usually with limited evidence.<span />

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molecules are attracted to one another by van der waals forces. how do van der waals forces compare with ionic and covalent bond

vitfil [10]

<h2>Answer:</h2>

Ionic bond: It is the bond formed by the complete transfer of electron from one atom to an other atom.
Covalent bond: It is the bond formed by the mutual sharing of the electrons.
Van der waal: These are weak interactions between one molecules with other polar or non polar molecules to hold to each other by weak force of attraction.

<h2>Explanation:</h2>

<u>Similarities between van der waal, ionic bonds and covalent bonds:</u> All of them are a type of inter-molecular forces, in which ionic bonds are stronger than covalent bond and van der walls forces. And covalent bonds are stronger than van der wall forces.

<u>Difference between van der waal and ionic bonds:</u> Ionic bonds are formed by complete transfer of electrons from one atom to an other atom. Covalent bond are formed by sharing of electrons while in van der waal, there is a slight attraction when oppositely charged molecules come close to each others.

Result: Van der wall forces are weakest among ionic and covalent bonds.

7 0

4 years ago

The more early abortions a woman has, the more likely it is that she will become sterile. true false

sergejj [24]

False?, it more or less goes on the amounts of abortions the more you get the more chances you'll become infertile,

6 0

4 years ago

Why does the government of nepal encourage farmers to establish boigas plants?write two reasons

Lisa [10]

Answer: The government is expanding its efforts to encourage public institutions, municipalities and commercial sectors to convert biodegradable wastes into energy by constructing large-scale biogas plants.

The deepening energy crisis as a result of Indian blockade along the major trade borders has offered an opportunity to become energy-independent as well as to improve solid waste problem by generating electricity from it, officials said.

Alternative Energy Promotion Centre (AEPC), the government body responsible for promotion and development of renewable and alternative energy technologies, is joining hands with the security agencies to build over 500 large-scale biogas plants across the country, said Sushim Man Amatya, programme officer working on Large Biogas and Waste to Energy at the AEPC.

The agreement between the AEPC and the security agencies, including Nepal Army, Nepal Police and Armed Police Force, to build institutional biogas plants is expected to take place within this month.

7 0

3 years ago

In Asia, human population growth and land development have fragmented forest habitats. Because of this fragmentation, tigers hav

3241004551 [841]

Answer:

Isolation of the tigers´ populations will cause an increase in inbreeding events, meaning a significant reduction in genetic diversity in each population. The loss of genetic variability will cause a reduction in the fitness of individuals. The population's survival will be threatened, with high chances of getting extinct.

Explanation:

Due to technical problems, you will find the complete explanation in the attached files.

Download pdf

7 0

3 years ago

Suppose a species of bird called the red‑crested warbler has a plumage length that is controlled by a single gene. The P????mPlm

andreev551 [17]

Answer:

Check the explanation

Explanation:

North American:

112 birds total => 224 alleles

112 - 55 birds = 57 short plume birds.

$q^2$ = (2*57) / 224 = 0.5089

Freq(short plume allele) = q = 0.7134

Freq(long plume allele) = p = 1 - q = 0.2866

From this North American population we get

0.2866 * 224 = 64 long plume alleles

0.7134 * 224 = 160 short plume alleles

South American:

452 birds total => 904 alleles

452 - 75 birds = 377 short plume birds.

$q^2$ = (2*377) / 904 = 0.8341

Freq(short plume allele) = q = 0.9133

Freq(long plume allele) = p = 1 - q = 0.0867

From this South American population we get

0.0867 * 904 = 78 long plume alleles

0.9133 * 904 = 826 short plume alleles

Blended population has

64 + 78 = 142 long plume alleles

160 + 826 = 986 short plume alleles

142 + 986 = 1128 total alleles

p = 142/1128 = 0.1259

q = 986/1128 = 0.8741

All right. The new population has the p and q from the blended population. The new population has 1000 individuals. The portion of long plumed will be homozygote long plumage + heterozygote, which is $p^2$ + 2pq, and you multiply that by the population size 1000 to get the final answer.

population size * ( $p^2$ + 2pq) = 1000 * (0.1259^2 + 2*0.1259*0.8741) = 236 birds

4 0

3 years ago