Which of these hydrocarbons has a double bond in its carbon skeleton?

a. C3H8

b. C2H6

c. CH4

d. C2H4

(I don't know how to find out if their is a double bond based on the molecular formula)

DNA would be found in which classification of biological molecules? A) Lipids B) Carbohydrates C) Nucleic acids D) Proteins

Which of the following is a cluster of cells that surround a developing egg in the ovary

The planet most noted for its rings is

In black bread mold spores are produced in structures called

Why do animals dont have any pets? (Ex. a bear has a pet dog.)

Tenho uma dúvida sobre uma coisa, por favor me expliquem para onde vai a água da chuva que cai sobre a areia, já que dificilmente vemos se formarem poças e por que vão pra esse lugar?

Beginning with newly-formed igneous rock describe the processes and paths that could move the material through the rock cycle until it again forms newly cooled igneous rock

5. What are common uses of epidemiology?

A vitamin d deficiency in childhood may result in which disease characterized by inadequate mineralization of the skeleton? a vitamin d deficiency in childhood may result in which disease characterized by inadequate mineralization of the skeleton?

What happens to monomers when they undergo dehydration synthesis? They form long chain-like molecules. They become dry and powder-like. They combine with water molecules. They break up into smaller molecules.