When does crossing over occur?

a) meiosis

b) mitosis

c) both

d) neither

Which aspects of renal function are involved in the regulation of blood pressure

Name two ways that carbon (usually in the form of CO2) enters the atmosphere

In december 2004, a tsunami (giant wave) destroyed many of the marine organisms along the coast of the indian ocean. what can be expected to happen to the ecosystem that was most severely hit by the tsunami

A flashlight produces light using energy from the batteries. In which order does the energy change form?

If cellwall allow everything to the cell than how can we say that cellwall protect the cell?

Which choice below best shows various types of genetic material in order from simplest to most complex? a. chromosome, gene, genome b. gene, genome, chromosome c. genome, gene, chromosome d. gene, chromosome, genome?

Problems the vegetable vendors face in their job

Which statement best describes why electrons are typically not included when determining the mass of an atom? The charge of a proton cancels the charge of an electron. The protons and neutrons are much more massive than the electrons.

What did the evidence that Darwin collected during his voyage on the HMS Beagle allow him to accomplish? A. to propose the theory of artificial selection B. to propose the theory of evolution by natural selection C.

List four types of evidence used to organize organisms in systematic taxonomy