Which of these is not a primary plant macronutrient?

oxygen

potassium

phosphorous

nitrogen

What is the problem in this article? what solution does the article propose?

In which layer do organisms on earth love?

Match the following items 1. rr 2. rr 3. identical alleles 4. unlike alleles 5. rr ()homozygous, recessive ()homozygous definition ()heterozygous, dominant cell ()heterozygous definition () homozygous, dominant cell