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3 years ago

Primary succession would most likely occur after? a forest fire. a lava flow. farm land is abandoned. a severe storm.

1 answer:

8 0

'The best answer is a lava flow. Primary succession happens in lifeless areas or regions where soil is not capable of sustaining life which may be caused by lave flows, retreating glaciers or newly formed sand dunes. It is one of the two types of biological and ecological succession.

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Explain the peppered moth events in terms of natural selection

LenKa [72]

Answer:

Tutt suggested that the peppered moths were an example of natural selection. He recognized that the camouflage of the light moth no longer worked in the dark forest. Dark moths live longer in a dark forest, so they had more time to breed. All living things respond to natural selection.

Explanation:

6 0

3 years ago

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. There has been much debate about the classific

Step2247 [10]

We reject the options a) and b) since the question says that the data supports "equally" both cases - so we have no basis for making a choice either way.

Further, in science the decisions are reached based on facts, not voting, so we also reject the answer D .

We are left with the answer C and this is also the best practice in science - when unsure, leave it as a hypothesis.

3 0

3 years ago

Read 2 more answers

Differentiate the types of muscle- skeletal, cardiac, smooth

Phantasy [73]

Answer:

Skeletal muscle moves bones and other structures. Cardiac muscle contracts the heart to pump blood. The smooth muscle tissue that forms organs like the stomach and bladder changes shape to facilitate bodily functions.

Explanation:

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2 years ago

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Which of the following is NOT true about mitochondria? A. They are found in eukaryotes. B. The outer membrane is coated in ribos

Shalnov [3]

THE ANS IS:

THE OUTER MEMBRANE IS COATED IN RIBOSOMES .

WELL U REPEATED AN OPTION TWICE BUT HERE'S THE ANS

3 0

3 years ago

Read 2 more answers

In humans, Rh-positive individuals have the Rh antigen on their red blood cells, while Rh-negative individuals do not. If the Rh

bixtya [17]

Answer: 60%

Explanation:

In population genetics, the Hardy-Weinberg Principle states that the genetic composition of a population remains in equilibrium as long as no natural selection or other factors are active and no mutations occur.

The frequencies of the genotypes of an individual locus will be set to a particular equilibrium value. It also specifies that these equilibrium frequencies can be represented as a simple function of the allelic frequencies at that locus. In the simplest case, with a locus with two alleles A and a, with allele frequencies of p and q respectively, the principle predicts that the genotypic frequency for the dominant homozygous AA is p^2, that of the heterozygous Aa is 2pq and that of the recessive homozygous aa, is q^2. The allele frequency of a is represented as p and the frequency of recessive allele is q.

The three genotypes AA : Aa : aa appear in a ratio p² : 2pq : q². If we add them up, we get the unit:

p^2 + 2pq + q^2 = (p + q)^2 = 1

And p + q = 1

Rh-positive genotypes are represented as AA (homozygous dominant) or Aa (heterozygous) since the presence of a single dominant allele is sufficient to express the phenotype. While Rh-negative genotypes are represented as aa.

If 84% of the population is Rh-positive, that means that this percentage includes all those who are AA and Aa. Then 16% are aa.

F(aa)=q^2=0.16

then F(a)=q=0.4

And since p + q = 1, p + 0.4 = 1, then p is 0.6

We can also calculate the rest, then F(AA)=p^2= 0.36

So F(Aa)= 2pq = 2 x 0.6 x 0.4 = 0.48

Notice that 0.36 + 0.16 + 0.48 = 1

3 0

3 years ago