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3 years ago

A scientist noticed that in acidic pond water some salamanders developed with curved spines. This was an example of a(n)

Biology

2 answers:

In-s [12.5K]3 years ago

8 0

Answer:

С. observation

Explanation:

Hope this will help

ANTONII [103]3 years ago

4 0

Answer:

С observation

Explanation:

This mode of investigation is an example of observation.

Observations are carried out using our senses and keen inquisitiveness. It can take place within a short period of time or an extended duration.

So; noticing the change in shape of the salamanders is making an observation.

Our sight, smell, taste e.tc are all observational tools.

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25. A post-doctoral research student is working with a culture of bacteria that doubles in size every 72 hours. The initial popu

ale4655 [162]

Answer:

$P=750 e^{0.00963t}$

The population size would be 753,190 after 30 days

Explanation:

Since, the population growth function is,

$P = P_0 e^{rt}$

According to the question,

if t = 0, P = 750,

$\implies 750 = P_0 e^0\implies P_0 = 750$

Also, if t = 72, P = 1500,

$\implies 1500 = P_0 e^{72r}\implies 1500 = 750 e^{72r}\implies 2 = e^{72r}\implies \ln 2 = 72r\implies r = \frac{\ln 2}{72}\approx 0.00963$

Hence, the required function would be,

$P=750 e^{0.00963t}$

If t = 720 hours ( 30 days = 720 hours ),

Then, the population after 30 days would be,

$P=750 e^{0.00963\times 720}=750 e^{6.912}=753190.30695\approx 753190$

6 0

3 years ago

Since most personal watercraft (pwc) do not have brakes, what must be done in order to avoid an obstacle?

Alex_Xolod [135]

With Personal Watercraft having no brakes, the best thing to do in avoiding obstacles is to take caution and slow down while operating the Personal Watercraft boat but when obstacles are ahead and you need to use methods, it is best to apply throttle and after that, steer quickly.

7 0

4 years ago

Complete the sentence about the continental drift theory

sergeinik [125]

The correct answers are:

1. C. Western Africa;

2. B. Eastern South America;

Alfred Wegener has spent lot of times looking at maps, as it was his job. One day he noticed something peculiar, the western coast of Africa and the eastern coast of South America were an almost perfect match. They looked like peaces of puzzle that belong together. In his mind this was suggesting that these two continents had been merged in the past, and than broke apart. He later got proof about his theory by observing the sea mounts in the Atlantic Ocean.

3 0

4 years ago

Read 2 more answers

Does the hallux (big toe) of Carpolestes have more synapomorphic features shared with the euprimate, or more symplesiomorphic fe

Alja [10]

Note: <em>You will find the missing image needed to answer the question in the attached files</em>.

Answer:

The hallux (big toe) of Carpolestes has synapomorphic features shared with the euprimate.

The nail on the distal phalange is an example of a synapomorphic feature.

Explanation:

The symplesiomorphic features are those shared by two or more organisms that inherited it from a common ancestor, but this trait is older in relation to those traits exhibited in other descendants of that same ancestor.

The synapomorphic features are those shared by two or more organisms that inherited it from a common ancestor, and which evolved for the first time in it.

There are more synapomorphic features shared with the euprimates. The nail on the distal phalange of the big toe and euprimates might be considered as a synapomorphic feature. It is quite different from the same nail of the tree shrew.

5 0

3 years ago

Dr. Haxton told one of his students, "To move in the bloodstream, fats need the help of phospholipids." What would a good studen

GarryVolchara [31]

Answer:

C. Yes. Nonpolar molecules aren't compatible with water.

Explanation:

Blood has the liquid plasma, a watery medium. Fats are nonpolar and can not enter the bloodstream as such. The long-chain fatty acids and monoglycerides enter the absorptive cells of the small intestine and form the triglycerides again.

These triglycerides are packed into chylomicrons by making aggregates with phospholipids and cholesterol and become covered with proteins. These packed fats enter the bloodstream in the form of chylomicrons.

4 0

3 years ago

Read 2 more answers