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Marina86 [1]
3 years ago
15

Bio_U06_USA_FY2

Biology
1 answer:
Alchen [17]3 years ago
5 0

Answer:

RNA formation - DNA formation - Development of simple bacteria

Explanation:

According to the theory of origin of life on Earth, life begin with RNA formation which can copy itself.s

Scientist though that RNA evolved from a chaotic soup of molecules.

RNA was the first molecule in the origin of life on Earth as mode of heredity, it stores and expressed genetic information before DNA formation.

DNA contain and stores the instructions for building living things to form simple bacteria to bumble bees. proteins help to drive the chemical reactions that help to keep cells alive and healthy.

You might be interested in
Replication is when DNA is?<br> O Mutated<br> O Changed<br> O Copied<br> O Destroyed
Karolina [17]
Copied, I agree with the person above ^ :’)
4 0
3 years ago
What have scientists determined forms and shapes land masses here on Earth?
salantis [7]

C

A Land mass is large geographical area that is surrounded by oceans. Therefore this can be synonymous to continents.

Explanation:

The crust is divided into tectonic plates that are dynamic because they move on top of the semi-plastic mantle.  The movement of the tectonic plates is driven by the convection currents of the mantle that drag along the crust above.  The tectonic plates collide at convergent boundaries where tectonic plates are consumed as one is subsided into the mantle. On the other hand, new crust is formed at divergent boundaries where two tectonic plates move away from each other and magma rises from the mantle and cools into new crust.

The convection  currents occurs because the lower mantle is hotter and less dense compared to the cooler denser upper mantle. Therefore the upper mantle always tends to sink as the lower mantle rises. These convection currents are the same as in any other fluids that are disproportionately heated.

Learn More:

brainly.com/question/7667599

#LearnWithBrainly

8 0
4 years ago
An 80-year-old client with a history of coronary artery disease is admitted to the hospital for observation after a fall. during
lara31 [8.8K]
Orthopneic

The client's paroxysmal dyspnea was probably caused by sleeping in bed with the legs at the level of the heart; this position increases venous return from dependent body areas, increasing the intravascular volume. Sitting up and leaning forward while keeping the legs dependent slows venous return as well as increases thoracic capacity. Although the contour position elevates the client's head, it does not place the legs in a dependent enough position to substantially decrease venous return. The recumbent position is contraindicated. Venous return increases when the lower extremities are at the level of the heart. Also, the pressure of the abdominal organs against the diaphragm decreases thoracic capacity. The Trendelenburg position is contraindicated. Venous return increases when the lower extremities are higher than the level of the heart. Also, the pressure of the abdominal organs against the diaphragm decreases thoracic capacity.
3 0
3 years ago
Which of the following is characteristic of the parasympathetic division? A. stimulates secretory activity B. dilated airways C.
alisha [4.7K]

The correct answer is: A. stimulates secretory activity  

Parasympathetic nervous system is a part of the autonomic nervous system (a division of the peripheral nervous system (PNS), so it means it regulates unconscious actions in an organism. Parasympathetic system is known as a system for stimulation of "rest-and-digest", when the body is at rest (differ than sympathetic which is active for fight-or-flight response). Parasympathetic system works usually after the meal and it is involved in the functions such as, secretory activities (salivation, lacrimation ), urination, digestion and defecation..

8 0
4 years ago
Which characteristics do birds and mammals share? Check all that apply.
valkas [14]

Answer:

B and E

Explanation:

The correct answer would be that <u>both birds and mammals are vertebrates and are also endothermic.</u>

Both birds and mammals belong to the same animal kingdom. They also belong to the same chordate phylum but belongs to different classes under the phylum. However, they both belong to the same sub-phylum Vertebrata - a group of chordates with the vertebral column.

Birds (aves) and mammals represent different classes of animals. Birds lay eggs that later hatch when conditions are right to give rise to their young ones. Mammals, on the other hand, give birth to their younger ones and are able to produce milk through their mammary gland to feed them. The body of mammals is characterized by the presence of hairs that help insulate the body making them to be homoiothermic, unlike birds that of birds, where hair is replaced with feathers.

However, both birds and mammals are endothermic, that is, they both maintain a fairly constant body temperature irrespective of the temperature of their environment.

The correct options are B and E.

6 0
3 years ago
Read 2 more answers
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