Answer: Option C.
Quickening.
Explanation:
Quickening is a period in pregnancy in which the pregnant mother start to feel the movement of the foetus. Foetus may begin to move as early as 14 to 16 weeks from the start of their last period but variations is common in quickening. Some foetus might begin to move as early as 12 to 16 weeks of pregnancy, from the start of last period. The pregnant mother will begin to notice a pattern when quickening begins.
Answer:
d. malleus > incus > stapes > oval window
Explanation:
Sound waves enter external auditory canal which makes the eardrum to vibrate. Malleus is in contact with eardrum while stapes is in contact with the oval window. Movement of malleus makes the incus to move which in turn stimulates large movement in stapes.
Since stapes is in contact with the oval window, the vibration from stapes passes to the oval window. Hence, among the given options, the correct order of movement of sound waves is "malleus > incus > stapes > oval window"
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Answer:</h2>
Option A. Bacteria.
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Explanation:</h2>
- It is presumed that, over millions of years of evolution, abiotic molecules evolved into the self-replicating molecules by means of natural selection.
- Cyanobacteria, or blue-green algae is a bacteria which was one of the oldest fossils found on earth. These microbes conduct photosynthesis: using sun light, water and carbon dioxide to produce carbohydrates and oxygen.
- Cynobacteria played a major role in forming oxygenated atmosphere.
- The first living things on the planet Earths was single-celled micro-organisms which lack a well defined cell nucleus were known as prokaryotes, and bacteria belongs to prokaryotes ans hence among given options bacteria matches the most for the first life form on earth.
Result: Among the given choices bacteria was most similar to first living things on earth.
Answer:
D.
Explanation:
the term natural selection is how evolution takes place