Speciation has definitely occurred when two groups of related organisms

A. Cannot interbreed successfully

B. Have Drastically different behaviors

C. Have Drastically different behaviors

D. become permanently isolated from each other

Explain how pathogens are spread by coughing and sneezing. what can be done to prevent the spread of these diseases? people's choices can have a positive or negative effect on their health.

Who used a compound microscope to see chambers within a cork and name them cells

Think of a chemical or material inside the human body that would be synthesized within bacteria what would be the potential benefits of this process what would be the potential drawbacks

DNA does NOT contain the nitrogen base

For any activity such as running, jumping, or hunting, animals have to use energy obtained from food. What organelle similar function within a cell to fuel cellular activities? a. Nucleus b. Mitochondria c. Vacuole d. Cell membrane

Find the common radio of the sequence. - 4,8,-16,32,

Grandpa Sam used to tell his grandkids how he first laid eyes on Grandma Sylvia. "When I was courting your granny, I was dazzled by her beautiful, LONG eyelashes. What a looker she was." "Yes, and a handsome man he was too," said Grandma Sylvia.

Jim is categorized as poor. Thus Jim's daily income must be less than how much dollars? Jim must be earning less than dollars per day.

Why does blood pressure decrease as the blood travels from arteriesto arterioles to capillaries?

Kangaroos that nurse their young in a pouch are what type of mammal? monotreme marsupial placental mammal