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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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What do we call the energy that travels from the sun in the form of waves

Gre4nikov [31]

Answer:

Solar energy is essentially the light and heat emitted from the sun

5 0

3 years ago

Can someone help me with questions 8-12? What type of reaction is it?

statuscvo [17]

Isn't that a substitution reaction? Sorry if i am wrong haven't taken these in a while

5 0

3 years ago

If the density of a liquid 102g/cm^3, how many milligrams will be in 63 mL of that liquid?

Ede4ka [16]

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question

63 mL = 63 cm³

We have

mass = 102 × 63 = 6426

But 1 g = 1000 mg

6426 g = 6426000 mg

We have the final answer as

Hope this helps you

6 0

3 years ago

Draw the line-angle formula for the most stable carbocation with a molecular formula of: You do not have to consider stereochemi

Yuki888 [10]

Answer:

Following are the answer to this question:

Explanation:

The most stable carbocation is: $C_9H^{+}_{11}$

The means of $C_9H^{+}_{11}$ is a hydrocarbon with $C_9H_{12}$ , which is needed to find the double bonds.

The formula for calculating the unsaturation hydrocarbons are:

Degree of the unsaturation

$= \frac{2C+2+N-X-H}{2}$

Where,

C=9, N=0, X=0, H=12

$\ Degree \ of \ the \ unsaturation= \frac{2\times 9+2+0-0-12}{2}$

$= \frac{20-12}{2}\\= \frac{8}{2}\\=4$

which means 3 double bonds and 1 ring.

The most stable carbocation is given in the attachment file. please find the attachment.

4 0

3 years ago

Identify each pair of elements as likely to participate in ionic bonding when bonded together. Use your periodic table.

alekssr [168]

Answer:

1) NaCl, 5)MgS

Explanation:

What makes something an Ionic Bond:

Ionic bonds are generally between two oppositely charged ions. Usually salts are formed.
A metal and nonmetal are also generally considered to be ionic.
Electronegativity also plays a role in a difference of electronegativity of elements being greater than 2.0.

For 1) Na has a charge of 1+ and Cl has a charge of 1-. They both come together to form table salt. Their electronegativity is also larger than 2.0. Also Na is a metal and Cl ion is a nonmetal.

For 2) C and O are both nonmetals and are covalent bonds

For 3) Water is a polar covalent molecule because there is a electronegativity difference between H and O, but not great. H and O are also nonmetals.

For 4) While Fe is a metal and O is a nonmetal, their electronegativity difference is not greater than 2.0. This makes it polar covalent.

For 5) Mg is a metal and S is a nonmetal. They have a large electronegativity difference. Also Mg has a charge of 2+ while S has a charge of 2-.

5 0

3 years ago