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2 years ago

I don't know how to do any of this someone pls help me with answers

Biology

2 answers:

Darina [25.2K]2 years ago

5 0

Okay First off what are the problems and what are the hardest ones?

borishaifa [10]2 years ago

3 0

It's not that hard if you use the pyramid in the corner.
The formulas are;
d/v = t
d/t = v
vt = d

For the first one they give you the distance (d) and the time (t). So, you do 27 (the distance) times 10 (the time) to get 270 m.

The second is set up the exact same way. distance x time. But you have to convert the hour to seconds. There are 60 seconds in 1 minute, and 60 minutes in an hour so do 60x60 and you get 3,600.
Do 33x3600 and it equals 118,800 m.

For this one you have to do

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2 years ago

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HELP!! DNA was isolated from water samples taken from six different sites. This gel

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After running DNA in a gel, bands of different sizes and species might appear. Scientists know silver carp are at North Shore site 1 because one of the bands in lane 1 matches a band in the positive control (Option C).

When DNA was isolated and run in a gel, many bands migrated to different points.

These bands were the different-sized fragments of DNA samples from different species from the six sites.

Researchers wanted to figure out where the silver carp is.

To do it, they needed to identify the bands on the gel that belonged to the silver carp DNA, so they included negative and positive controls to make comparisons.

<h3>Positive and negative Controls</h3>

Negative and positive controls guarantee the interpretations of the results.

The positive control shows the band sizes that belong to the silver carp DNA.

Any band in the sampling sites that matches one of the positive control bands indicates that the species is present at that site.

The negative control is the opposite. It is the absence of the species' DNA.

<h3>Results interpretation</h3>

As we can see, there are four sites where the bands match one of the bands of the positive control. These are,

North shore site 1
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This means that at these four sites, the silver carp is present.

So scientists know silver carp are at North Shore site 1 because one of the bands in lane 1 matches a band in the positive control (Option C).

By looking at the lane of the North Shore site 1, we can also see another band (Thinner and grey). But this band does not match either of the positive control bands. This result suggests that the grey band belongs to another species' DNA.

You can learn more about gel electrophoresis at

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2 years ago

Darwin studied actual birds on the Galapagos Islands instead of using a simulation, as you did in this lab. Studying natural sel

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Darwin lived in a time where natural selection was a strange theory among scientists and researchers. This was especially true when other researcher Lamarck argued that organisms passed on helpful traits to their offspring, that they magically could form a new trait to adapt to their environment and then pass it onto their offspring. For example, if a giraffe was too short to reach food, it would grow a larger neck in its lifetime and then pass that trait onto its offspring. Darwin argued that, through the process of survival of the fittest, that short giraffe would die off and never receive the chance to pass on its shortness to future populations. Thus, taller giraffes would survive— they can reach food, shorter giraffes can’t— and the short genes would disappear. The fact that Darwin was introducing a new theory that nobody was used to at the time was peculiar, so he had few people on his side until long after his observations.
Another problem Darwin had was the lack of technology. To travel, Darwin would have to use boats to reach far away places, and of course, this took time.
The final problem Darwin had was the extra time it took for evolution, a process that can take up to millions of years. Evolution didn’t occur over night— it took time for Darwin to conduct experiments, observe, conduct them again, come to a conclusion, and so on.
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2 years ago

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Please... I need help!!!

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2 years ago