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spin [16.1K]
3 years ago
14

Bacteria are only found on "dirty" surfaces or objects. * O True O False

Biology
2 answers:
storchak [24]3 years ago
6 0

Answer:

False

Explanation:

AleksandrR [38]3 years ago
5 0
False, bacteria can be found anywhere
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A normal man and normal woman marry. What is the chance that they will produce a male child with Down's syndrome?
nikitadnepr [17]

Answer:

The chance of a normal couple having a child with down syndrome is 1 to 600 births.

Explanation:

Down syndrome is a genetic flaw that occurs when the fetus is being formed.

A human cell considered normal has 46 chromosomes, divided into 23 pairs. For some unknown reason, an error may occur at the beginning of embryonic development and an extra chromosome is created, which binds to par 21. The result is cells with 47 chromosomes. This causes the said syndrome.

It is important to know that this failure happens at random. It is nobody's responsibility. It has not been proven to date that lifestyle, actions during pregnancy, smoking, drinking, medicines, environmental factors or kinship between the couple can influence this occurrence. She is not contagious either. The likelihood of a normal couple having a child with the syndrome is approximately 1 to 600 births.

8 0
3 years ago
HELP ME WITH THIS 60 POINTS,5-STAR RATING, AN THANKS AND MARKED AS BRANLIEST.
mel-nik [20]

Answer:

Independent Variable: temperature

dependent variable: chirps

Hypothesis: the lower the temperatures the less chirps

constants: temperature or food and water

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6 0
3 years ago
Small rocks that have been broken down by weathering and erosion are called.
Lilit [14]

Answer: Sediment. Hope this helps :^)

4 0
2 years ago
Write a short essay (not more than 5 sentence ) on how you think life began on earth​
Snezhnost [94]

Answer:

The earliest known life-forms are putative fossilized microorganisms, found in hydrothermal vent precipitates, that may have lived as early as 4.28 Gya (billion years ago), relatively soon after the oceans formed 4.41 Gya, and not long after the formation of the Earth 4.54 Gya.

Explanation:

7 0
3 years ago
20) In order for high force cross bridges to form in contracting skeletal muscle, calcium must A) phosphorylate the troponin to
SashulF [63]

Answer:

E. bind to troponin which moves the tropomyosin

Explanation:

calcium ions bind to troponin, causing conformational changes in troponin that allow tropomyosin to move away from the myosin binding sites on actin. Once the tropomyosin is removed, a cross-bridge can form between actin and myosin, triggering contraction

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3 years ago
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