During prophase I of meiosis:

crossing-over occurs

homologous chromosomes form tetrads.

synapsis occurs

all of these occur

Where do streams and rivers get their start?

What is a standard for acceptable behavior within a society called (apex)

What is the term for doctors stopping the treatment of a terminally ill person by turning off respirators or other life-support machines?

Duration is a measure of the amount of time in which an event occurs. What is an example of a natural event with a very short duration?

A nurse is assessing a newborn in the well baby nursery. what type of respirations does the nurse expect to identify in a healthy newborn?

According to "Life Without Gravity," why can astronauts' muscles become weak? A. Without gravity, the blood is rerouted from the legs to the head. B. Without gravity, the body "grows" by as much as several inches. C.

What type of igneous rock has two distinct grain sizes indicating two stages of cooling

A certain type of diploid organism has 38 chromosomes. how many chromosomes would a gamete of this organism have?

Griffith, in his 1928 experiments, demonstrated that bacterial strains could be genetically transformed. The evidence that DNA was the "transforming principle" responsible for this phenomenon came later.

Is the organism Fern extinct