Viruses can be prevented by receiving a weakened form of the virus called a? A)plastid
B)vaccine
C)antibiotic
D)fertilizer

Genetic diversity is the variation in the genes of an entire species. each circle represents a population of a particular species in different habitats. select the population with maximum genetic diversity

The image shows embryos of three vertebrate classes

Which of the following is true of photosynthesis? a)carbon dioxide is a reactant b)water is a product c)most reactions within this process are exothermic d)oxygen is a reactant