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)

What discovery in the 1900s supported mendels ideas

While examining a specimen under the microscope, Janet discovers a structure that has some genetic material that has RNA but not DNA. What is the specimen? A. virus B. plant C. fungi D. bacteria E. animal

In an energy food pyramid, what level would you find your carnivores a. producers c. secondary consumers b. primary consumers d. decomposers

Which of the following statements about air pollution is not true? a. Air pollution is caused by natural and human processes. b. Carbon monoxide and sulfur oxides are common air pollutants. c.

Explain how stem cells grow in a laboratory culture. 1. Embryonic-- 2. Adult--

Explain why it would be detrimental to desert plants to have a large number of stomata on their leaves

What is necessary to grow plants on mars then into something that produces a food

How do materials enter and leave the cell

What is the relatioship between I tissues and organs?

Which of the following pairs is mismatched? a. green algae - prokaryotic b. red algae - agar c. dinoflagellates - paralytic shellfish poisoning d. brown algae - algin e. diatoms - petroleum