Melissa has 36 more crayons than her brother her brother has 49 crayons how many crayons does Melissa have?

4. What conditions produce the fastest chemical weathering? a) Cold and dry b) Hot and dry c) Hot and wet d) Cold and wet

How does heat energy get from the Earth's surface to air? A) Convection B) Conduction C) Emission D) Radiation

The sides of the DNA ladder (backbone) are A. alternating carbons and nitrogens. B. the R groups. C. the nitrogenous bases. D. alternating nitrogens and phosphates. E. sugars and phosphates.

Why plants don't need specialized respiratory system?

What are the most abundant elements in the body

Suppose that two ancient types of plants, one that grows in the winter and one that grows in the summer, appear together in the fossil record for two periods in the geologic time scale.

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How are traits inherited by offspring?

In homeotic mutants: Group of answer choices one body structure is missing. one body structure has been changed into another. one body structure has been duplicated. one body structure has significantly increased in size. the organism is infertile.

What effect of acid rain on a ecosystem is