If both parents carry the recessive allele that causes cystic fibrosis, the chance their child will develop the disease is?

Punctuated equilibrium verses gradualism have long been contested as ways in which species evolve. choose the best evidence for gradualism.

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

When analyzing tree rings, what do scientists assume a thin ring indicates?