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agasfer [191]
3 years ago
5

The image shows a group of birds flying in a V-shaped pattern. Which statement is best supported by the image? The birds are clo

se together so they have a better chance of finding mates and increasing their reproductive success. The birds are part of a eusocial society so they have a better chance of finding mates and increasing their reproductive success. The birds are aerodynamically efficient so they can use the air around them to reduce the energy used to fly. The birds are part of a eusocial society so they can use the air around them to reduce the energy used to fly.
Biology
1 answer:
snow_tiger [21]3 years ago
6 0

Statement C. The birds are aerodynamically efficient so they can use the air around them to reduce the energy used to fly.

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This diagram shows that embryos of certain species develop almost identically in the earliest stages of embryonic development. T
umka21 [38]
The correct option is A.
The observation that the embryos of certain species have physical and genetical similarities in the earliest stages of embryonic development shows that individual development of an organism shows its revolutionary history and this is taken as an evidence of common ancestry. Scientists takes this observation to mean that all life on earth developed from a single ancestor.<span />
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3 years ago
Can someone help me with question 8 and 9
Alborosie

Answer:

8. A

Explanation:

they are moved by strong, steady winds called unidirectional winds, which move from the south west to the north east

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2 years ago
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4. How do ocean currents influence climate? Give an example of such an ocean current.
Nookie1986 [14]

ocean - Large bodies of water.

current flowing towards equator carry cold water from poles

current flowing towards away from equator carry warm water from poles

Example - Humidity

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3 years ago
Karl, who had his leg amputated after an injury, reports that he still feels pain in his missing leg. such an experience is refe
elena-s [515]
The answer to this question would be phantom pain 

An amputated leg sometimes still giving a fell of leg or pain even though the leg wasn't there anymore. That happened because the nerve fiber that carries the stimulus from that area is still alive. Something might induce the remnant of the nerve to send a signal of pain but the brain interprets the location to be in the removed limb.
3 0
3 years ago
The CRISPR/Cas9 system can cleave genomic DNA at sequences other than the desired target, a phenomenon referred to as off target
Deffense [45]

Answer:

The minimum length of a sgRNA sequence to avoid off target cleavage by the CRISPR/Cas system in the fly fruit genome is 14 bases

Explanation:

We are trying to use the CRISPR/Cas system to cleavage the genome of the fruit fly (which is 1.4x10^8 bp long). Also we desire the cleavage to be unique. That means we need a target sequence long enough to be able to assume it will only appear once in the genome.

First, we should think that in every position, we can find one out of four different nucleotide (A, C, T, G). So, the probability of getting a sequence of a given length "n" will be (1/4)^n (We are assuming that the probability of finding a nucleotide in the position "i", it's independent of the nucleotide we find in any other position "j").

Also, to know how many times a sequence will appear in a genome (the expected value of occurrence), we must multiply the probability of that sequence to randomly occur by the length of the genome. For our specific example, the number of occurence of a sequence of length "n" is:

nºoccurence=[(1/4)^n]*1.4*10^8

But in this case, what we want is the expected number of times the sequence will appear to be 1, and we want to obtain the length of the target sequence (n).

Given the information above, we know that:

[(1/4)^n]*1.4*10^8 =1

[(1/4)^n]=(1/1.4*10^8)=1.4*10^-8

Then, if we want to calculate n, we can use logarithms and its properties to get:

log[(1/4)^n]=log[1.4*10^-8]

n*log[(1/4)]=log[1.4*10^-8]

n=log[1.4*10^-8]/log[(1/4)] => n=13.29 approximately.

As the sequence needs to have a natural number of elements, <u>we can conclude that using a target sequence of a minimum of 14 bases with the CRISPR/Cas system in the fly fruit genome should be enough to avoid off target cleavage.</u>

3 0
3 years ago
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