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fiasKO [112]
3 years ago
13

Marsupials are found in North America and Australia, but they would not have been able to swim across the ocean. According to sc

ientists, how did this group of organisms come to live on two separate continents?
Biology
2 answers:
Pavlova-9 [17]3 years ago
6 0
Scientists said that it was because of airplanes
Virty [35]3 years ago
6 0
<span>The continents were once connected, and marsupials were able to migrate over the land.</span>
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A student made a model of an onion skin cell she viewed
Komok [63]

If a student made a model of an onion skin cell using a microscopic magnification scale of 500:1 and the length of the modeled cell is 15 cm, the real cell's length would be 0.03 cm.

The scale is 500:1. This means that the dimension of the real cell without being magnified under the microscope would be 1/500.

Thus, if the length of the cell under the microscope is 15 cm. This length has been multiplied by 500. In order to get the real length, it must be divided by 500.

              15 x 1/500

                             = 0.03 cm

More on microscopic magnification can be found here: brainly.com/question/14668612

6 0
3 years ago
You are doing an experiment in which you are using an in vitro translation system derived from rabbit reticulocytes, called a ra
Nadya [2.5K]

Answer:

Problems with transfection efficiency or absence of essential mRNA modifications (capping and poly-A tail)

Explanation:

Translation is the process of protein synthesis from RNA in which the genetic information encoded in a messenger RNA (mRNA) molecule is translated into a protein sequence composed of amino acids. Translation has three steps: initiation, elongation, and termination. During translation, different elements are required to initiate, continue and complete the process, which include essential molecules such as amino acids, mRNA, tRNAs, ribosomes, energy-carrying molecules (i.e., ATP, GTP), initiation factors (i.e., eIF1A, eIF3, etc) and elongation factors (eEF-2, EIF5A). For example, humans can't synthesize nine essential amino acids (i.e., threonine, tryptophan, phenylalanine, valine, methionine, leucine, histidine, isoleucine, lysine), thereby it is imperative to include these amino acids to synthesize proteins composed of them. On the other hand, it is also fundamental to take into account that the efficiency of transfection of the molecules required during translation, as well as the absence of modifications in the mature mRNA sequence, may alter the process in vitro.

3 0
3 years ago
I"M BEING TIMED PLEASE HELP ME!
Ulleksa [173]

The reaction against your skin is equal to the force put upon the object.

Zero net force is when forces are balanced, ie no velocity.

All forces put on an object have an equal and opposite reaction.

3 0
3 years ago
The thin mantle of life that covers the Earth is called a(n): a. ecosystem. c. population. b. biome. d. biosphere.
xxMikexx [17]
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5 0
3 years ago
What is the answer to this question
ira [324]

Answer:

y chromosome

Explanation:

only the father passes on the y chromosome and only the fathers are colorblind

7 0
3 years ago
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