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2 years ago

A carpenter sands a wooden board until it is smooth. It this a physical change or a chemical change?

Biology

1 answer:

AleksandrR [38]2 years ago

8 0

Physical change as no new substance is created

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Which of these landforms is most likely to be founded at a convergent boundary?

zysi [14]

D Mountain hope this helps

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3 years ago

In pea plants, flowers are either white or purple; the purple color is produced by pigments called anthocyanins. The production

Hoochie [10]

Answer:

7/16

Explanation:

<em>The proportion of the offspring from the cross that will have white flowers is 7/16.</em>

The presence of anthocyanin which determines purple coloration is conditioned by the C_ and P_ alleles. It means that the absence of one or both of C and P will result in white flowers.

Two plants, each with CcPp are crossed:

CcPp x CcPp

Offpring

1 CCPP - purple

2 CCPp - purple

2 CcPP - purple

4 CcPp - purple

2 Ccpp - white

1 CCpp - white

1 ccPP - white

2 ccPp - white

1 ccpp - white

Proportion of offspring with white flowers = 7/16

Proportion of offspring with purple flower = 9/16

<em>See the attached image for the Punnet's square analysis of the cross.</em>

6 0

3 years ago

Evidence for sea floor spreading

Tju [1.3M]

The rocks near the mid-ocean ridge were younger then rock near trenches. Matching bands of magnetic rocks were found on either side of the mid-ocean ridge; bands like tree ring - record changes in earths magnetic field over time. Earthquake data showed oceanic crust is sinking on to the mantle at trenches.

5 0

3 years ago

Read 2 more answers

What is the difference between an element and a molecule?

slavikrds [6]

Well, usually the qn would be what is different between a compound and a molecule. but if you ask like this then, here goes.

An element is the simplest substance that can not be broken down into its components using physical processes. exp: Na, S, K

A molecule is a substance that make up of an element bonded together.
exp: O2, S2, F2(diatomic molecules)

3 0

3 years ago

What colour would u expect the ethanol to go after the leaf has been boiled in it......explain it (its in the "test for starch r

maksim [4K]

Answer:

White

Explanation:

the boiling ethanol dissolves the chlorophyll and removes the green color from the leaf then it turns white

7 0

3 years ago