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kvasek [131]
3 years ago
10

What will happen if we don't protect birds

Biology
1 answer:
kakasveta [241]3 years ago
6 0

Answer:

Humans would lose a large part of their diet. Insects would would increase a lot. We would lose all products produced from bird parts.

Explanation:

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Primary succession can occur after a
lina2011 [118]

Answer:

B

Explanation:

creates something new its the start of succession.

6 0
4 years ago
Please explain why the inoculated plates are inverted during incubation.
sasho [114]

Answer:

Petri plates are incubated upside down to prevent contamination.

Explanation:

The plates are always incubated inverted or turned upside down on their covers during storage. This is done to prevent evaporation if plaque is stored for long periods, which can affect the growth efficiency of bacteria, or allow contamination by multiplying unwanted organisms such as mold.

Once the plaques have been filled with a damp suspension of bacteria, it should be allowed to evaporate shortly before overnight incubation. However, a moderate amount of moisture will still be present. If plaque is not inverted during incubation, bacteria will not be able to attach to the culture medium properly, which will either prevent them from growing and forming colonies properly or will encourage the growth of undesirable microorganisms.

Any of these results will invalidate the experiment. In addition, any condensation or moisture can cause streaking, which will make it difficult to select and analyze separate colonies. After bacteria form colonies, plaque is also stored upside down to maintain moisture levels.

6 0
3 years ago
A scientist is trying to determine how closely related a moth species is to four other moth species. He examined the DNA of each
Alex_Xolod [135]

The answer is ''B''.

3 0
3 years ago
Read 2 more answers
HELP!!! How does the equipment shown in the picture reduce the impact of an oil spill on marine life? A. It absorbs the oil as i
asambeis [7]

Answer:

D

Explanation:

An oil boom helps contain the oil so that it is easier for them to skim it off of the water. They aren't meant to clean up oil, only to contain the oil since it does not sink or mix with water.

5 0
3 years ago
Clinical manifestations of hypocalcemia include which of the following? (Select all that apply.) Positive Trousseau sign Positiv
kumpel [21]

Answer:

Positive Trousseau sign

Positive Chvostek sign

Hyperactive reflexes.

Muscle twitching, Paresthesias

When the blood conce

Explanation:

When the blood ca+ concentration falls below  the standard of 4.4-4.5mg/dL,that is below 4.4mg/dL the clinical condition is called hypocalcemia. It is caused by hypothyroidism,due to  malfunction of the parathyroid gland.

Generally, Ca+ is needed for contraction of muscles by causing the fusion of the vesicles containing neurotransmitters to the presynaptic membrane for the passage of neuro transmitters  to fuse with the receptors on the sarcolemma to initiate  muscular contractions by opening of ligand gated Na+. It also interact with the ligand gated  sodium ion channels

Generally,Ca+ inhibits depolarization of ligand gated Na+ channels. Thus blocks the opening of these channels and therefore the rate of excitability.Therefore, If the is low serum levels of Ca+,There is increased in the threshold of depolarization because more ligand gated Na+ channels are opened,Thus their is increased excitability of nerves and muscles fibres therefore in the  clinical manifestations listed above.

It can be treated with infusion of Ca+ into the blood.

7 0
3 years ago
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