How many neutrons does a calcium atom have

Which of these statements best describes an interaction between the atmosphere, hydrosphere and biosphere? A. Strong winds blow over a lake and create ripples. B. A river flows downhill at a very high speed and uproots trees. C.

Explain why there are a wide variety of phenotypes for skin color in humans.

A mental tumor would be found in the _?_. O a. brain Ob. thigh Oc. chin O d. back of head Oe. it is not located in any of these regions.

12-2 what are food chains and food webs

What are the standard units of specific gravity? a) g/cm^3 b) kg/L c) kg/cm^3 d) none

The table below shows the number of the sub-atomic particles in an atom of nitrogen. Sub-atomic Particles Sub-atomic Particle Number Protons 7 Neutrons 7 Electrons 7 What is the amu of a nitrogen atom?

The ions in a compound form and orderly three-dimensional arrangement called a molecule. true or false

How would a scientist study the relationship between the Tiktaalik roseae and modern fish and tetrapods? create a diagram that hypothesizes ancestry use relative dating use transitional fossils to determine age review its analogous structures

In fruit flies, the gene for red eyes (r is dominant and the gene for sepia eyes (r is recessive. if a red-eyed heterozygous fly (rr mates with a sepia-eyed homozygous fly (rr, what are the possible genotypes of their offspring?

The largest mass extinction event in the history the Earth occurred at the end of the ___ period. A. Cambrian B. Ordovician C. Devonian D. Permian