What substances must pass through a cells membrane for the cell to continue to function?

Is a group of species that includes an ancestral species and all of its descendants?

Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome.

Which of these is an example of elemental carbon? Diamond, methane, or proteins?

What are some good ideas for a science experiment/research? For 8th graders?

A preterm newborn is noted to have hypotonia, apnea, bradycardia, a bulging fontanelle, cyanosis, and increased head circumference. these signs indicate the newborn has which complication

Which of the following defines Romeo and Juliet as a tragedy, instead of a comedy?

Which of the following describes work? a) lifting a 1 kg mass for 1 m b) holding a 1 kg mass for 1 hour c) moving 1 m in 1 hour d) holding 1 kg mass

How would an object blocking a bronchus affect its airflow?

Mary is campaigning for improved air quality in her city. She is very concerned about carbon and methane outputs, but not phosphorous. Why is that? A. She thinks phosphorous makes a positive contribution to air quality, B.

Huntington's disease is a genetic disorder that is caused by a dominant allele. Which of the following is true? A. A person with Huntington's disease will pass the disease onto 100% of their children. B.