Which of the following biomes is found in Brazil?
Desert
Savanna
Tundra
Chaparral

Select all the true statements about the cosmic microwave background radiation

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

What are genotypes? what are phenotypes?