Which event occurred during the Mesozoic era? A. Humans lived on Earth. B. The first plants lived on the land. C. Pangaea, the super continent, began to break apart. D. Cyanobacteria begin to fill the air and water with oxygen.

What is the atomic nucleus made of? A. only neutrons B. electrons C. nucleons D. only protons

Why is there a huge facility that stores seeds

A good way for an adolescent to build and protect her bones is to:

A "widow's peak" hairline in humans is coded by the dominant allele W. A straight hairline is coded by the recessive allele w. A man with a homozygous dominant WWproduces a zygote with a woman with a heterozygous dominant Ww for the trait.

What role does a dna play in existence of cell?

Where does the energy come from to power the addition of a high-energy phosphate group to an adp molecule by atp synthase in the inner mitochondrial membrane?

Think about a food web in a marine, fresh water, or terrestrial ecosystem. Describe a producer-consumer relationship, a predator-prey relationship, and a parasite-host relationship within the food web.

Reactive oxygen species (ROS) are unstable, or reactive, compounds that result from the partial reduction of oxygen. ROS can cause damage to molecules, including membrane lipids and nucleic acids, and may be associated with some diseases.

Is it possible for Michael and Danielle to have a child who has type O blood? How do you know this? Was a switch made at the hospital? Explain your reasoning. How could fraternal twins be as different in appearance as Michelle and Michael, Jr.

The generation of an action potential in a neuron requires the presence what type of membrane channels?