The heart works as

A One pump

B) Two pumps

During dna replication what two processes must occur before the two strands separate

In one sentence describe what happened to the DNA during cell division

Which general category of sensory receptors detects variations in chemicals

17. What is the primary function of the cell membrane? A. It separates the intracellular components from the extracellular space and allows transport of materials into and out of the cell. B.

Hormones travel from endocrine glands through bloodstream to ___ organs.

When comparing lakes and oceans, most lakes have A) lower levels of salt. B) higher levels of salt. C) inconsistent levels of salt. D) about the same level of salt.

What happens when a cell needs energy?

What is the Rotation of Earth per hour?.

Spider monkeys in Costa Rica live in the rainforest, where they eat fruit and nuts from big forest trees. The trees also protect them from predators like jaguars and large snakes. The trees are the spider monkey's.

Which key difference do experiments have that correlation studies do not have?