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3 years ago

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings?

Chemistry

2 answers:

vesna_86 [32]3 years ago

8 0

A. The wings are analogous structures that evolved differently and do not have a similar internal structure.

Dahasolnce [82]3 years ago

5 0

Answer:

The correct answer is option A, The wings are analogous structures that evolved differently and do not have a similar internal structure

Explanation:

The analogous structure evolve in different species living in two different geographic location with similar environmental conditions. Thus, the analogous structures have similar function and purpose but since they have not evolved from the same ancestor their structure vary a lot for example – wings in both birds and butterfly are meant for flight but their structure is entirely different.

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12. If a substance has a pH of 3.5, is it<br> acidic or basic?

dolphi86 [110]

The answer is acidic.

pH < 7 = acidic

pH > 7 base

6 0

3 years ago

16. Which of the following are examples of ionic compounds? Select all that apply.

mrs_skeptik [129]

Answer:

KBr, FeF3

Explanation:

Potassium ion (K+) + bromide ion (Br-) make the ionic compound KBr

Iron (III) ion (Fe3+) + 3 fluoride ions (F-) make the ionic compound FeF3

NH3 has covalent bonds so it isn't ionic

Mg12 is an elemental compound

3 0

3 years ago

A gas has a of 590 mi. At a temperature What volume will the gas occupy at 30.0öc.1 Which gas law is this

scoray [572]

The given question is incomplete. The complete question is:

A gas has a volume of 590 ml at a temperature of $0^0C$ .What volume will the gas occupy at $30.0^0C$ . Which gas law is this?

Answer: 655 ml , Charle's Law

Explanation:

To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

where,

$V_1\text{ and }T_1$ are the initial volume and temperature of the gas.

$V_2\text{ and }T_2$ are the final volume and temperature of the gas.

We are given:

$V_1=590ml\\T_1=0^oC=(0+273)K=273K\\V_2=?\\T_2=30.0^0C=(30+273)K=303K$

Putting values in above equation, we get:

$\frac{590}{273}=\frac{V_2}{303}\\\\V_2=655ml$

Thus the volume at $30.0^0C$ is 655 ml

6 0

3 years ago

Is the volume of water measured using the graduated cylinder identical to the volume calculated

tatuchka [14]

<h2>Answer:</h2>

The volume of water measured using the graduated cylinder is <em>not exactly identical </em> identical to the volume calculated.

<h3>Explanation:</h3>

Calculated volume is theoretical value calculated from the density and mass of water.

But volume measured in cylinder can contain the personal error of individual.

Because in graduated cylinder volume is measured in a specific way that is:

Place the graduated cylinder on a flat surface and view the height of the liquid in the cylinder with your eyes directly level with the liquid.
The liquid will tend to curve downward.
This curve is called the meniscus.
Always read the measurement at the bottom of the meniscus.

3 0

4 years ago

A metal ion Mⁿ⁺ has a single electron. The highest energy line in its emission spectrum occurs at a frequency of 2.961 x 10¹⁶ Hz

Whitepunk [10]

Answer:

z≅3

Atomic number is 3, So ion is Lithium ion ( $Li^+$ )