About four or five days after fertilization, a group of cells forms a ball-like structure. what is the name of this structure? a. heart b. placenta c. blastocyst d. stem cell

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

What was the purpose of mendel's experiments with dihybrid crosses? a. to determine if dna was a transforming factor b. to determine if traits could be recessive c. to determine if traits affected each other d. to determine if traits had more than one allele

When a doggo starts to pace around in the same line for a hand full of days. what would that mean?