Atoms of the same element w/diff. # of neutrons are called?

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

Which short-term environmental changes would a very small asteroid or comet impact on earth most likely cause? check all that apply. flooding extinction craters on surface changes in weather patterns death of organisms and populations