What features signifies to astronomers that a distant star is part of a planetary system

A) the star periodically dims

B) the star expands into a red giant

C) the star moves through the sky

D) the star continuously gets brighter

How does the modern theory of evolution explain the loss of vestigial organs? How does the modern theory compare with Lamarck's theory of "use and disuse?"

A postsynaptic cell can be a neuron, a muscle cell, or a secretory cell. what is an example of a presynaptic cell

What are the polymers of nucleic acids called

The jellylike substance that contains dissolved molecular building blocks and in some type of cell organelles is called

What are two characteristics of all animals?

Why is the Calvin cycle considered a dark reaction

Describe the movement of molecules in the illustration Molecules are moving from a lower concentration to a higher Molecules are moving from a higher concentration to a lower Molecules are moving from a higher concentration to a lower concertation

Describe the steps involved in the breakdown of glycogen. How does this differ from the formation of glycogen from glucose?

A population of snail darters is drastically reduced by the introduction of a large predator fish into an isolated stream. the predators eat almost all darters less than 5cm long. this is an example of a. the bottleneck effect b.

Which person is most likely to be infected when exposed to foodborn pathogens