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Svetach [21]
3 years ago
9

The photograph below shows Jamal’s bird feeder. Jamal asked the question “Are hummingbirds attracted to red feeders?” Then, he s

et up an experiment to test the question. What is the independent variable in Jamal’s experiment? the amount of food the color of the feeder the height of the feeder the number of hummingbirds
Biology
1 answer:
notka56 [123]3 years ago
8 0

Answer:

hummingbird behavior

Explanation:

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Which of the following is directly related to deep-ocean currents?
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Answer:

The answer is:  Density  

Explanation:

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3 years ago
Which is used as evidence for the idea that multicellular organisms evolved from prokaryotes
anzhelika [568]

Living things has emerged into three domains called Archaea, bacteria, and eukaryotes. Evident that support the idea that multi cellular that is eukaryotic cell evolved from the prokaryotic cell are the descendents of the separate prokaryotic cells that together form a union which are inter dependent.

For example: The mitochondria which is referred to the energy source of the cell is considered as the great-great-great-granddaughter of a bacterium cell which is free living. This free living bacterium bacterial cell was consumed by an other cell and this remained as the stable guest in the cell. This mitochondria provided chemical energy to the cell and also protected the nutrient rich environment.  which surrounds it. This process of one organism residing in the other organism completely is called endosymbiosis.

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2 years ago
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Which of these statements best sums up evolution?
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Evolution can be defined as the process of the change occurring in a population over a period of time through genetic variation. This genetic variation and the process of natural selection help a species to evolve by selecting the traits that helps it to better adapt to the environment. These genetic variations are inherited over time as the species continue to evolve.

Hence, the correct answer is 'change in population through genetic variation over time'.

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3 years ago
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Item 5 What is the role of a generator in producing electricity? The generator stores electrical energy for later use in homes a
Anni [7]

Answer:

The generator transforms the mechanical energy of the turbine into electrical energy

Explanation:

Electricity generator is a device that is used in generating power supply which can be used in industries, homes and for commercial and private purposes.

It operates by converting mechanical energy into electrical energy for the use in an external circuit. mechanical energy can be obtained from steam turbines, internal combusting energy, gas and water turbines and it can be obtained through the rotating shaft.

The capacity of each generator determines the amount of energy it can supply to a given place.

4 0
3 years ago
Escherichia coli has a doubling time of 30 minutes. If a culture has 10 E. coli cells at the beginning of log phase, how many E.
Nat2105 [25]

80 E. coli cells will be in the culture after two hours.

<h3>What is culture?</h3>

The development of the human, plant, or animal cells in a lab, as well as microorganisms like bacteria and yeast. Cell cultures can be used for research, medication testing, and infection diagnosis.

Primary (mortal) cultures and cultures of established (immortal) cell lines are the two main categories of cultures.

One of the most crucial methods in cellular and molecular biology is cell culture because it offers a platform for studying the biology, biochemistry, physiology, metabolism, and other aspects of both healthy and diseased cells.

A culture of 10 E. coli cells.

Incubation time = 2 hours = 120min

Doubling time = 30min (120/30 = 4)

So, 1 cell - 30min = 2 cells - 30min = 4 cells - 30min = 8 cells - 30min

Therefore, 8 ₓ 10  = 80cells of E. coli at the end of 2 hours of incubation time.

To know more about cell culture refer to:    brainly.com/question/9177917

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