Claim/Evidence/Reasoning (CER): How is it possible that when the students first swabbed the Petri dishes, they did not see any bacteria on them, but a few days later, there are visible bacterial colonies? How did the spot of bacteria get so big in that time? st 7

the man is bald so he has no hair to get wet

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

the alkaline earth metals (beryllium (be), magnesium (mg), calcium (ca), strontium (sr), barium (ba), and radium (ra)) are a group of chemical elements in the s-block of the periodic table with very similar properties: shiny. silvery-white. hopefully this ? i didn't fully understand the question