When did dinosaurs become extinct?

Why has the cell theory not been disproved?

Homologous structures might be the result of a change in allele frequencies over successive generations. why have these structures probably continued? they were predestined in a species. they were beneficial in a particular environment.

How do you locate a specific gene in a grasshopper and extract it into another grasshopper?

1.) why do you weigh more in earth then the moon? 2.) why does mass of an object never change regardless if it's on the moon or earth? 2 sentences are fine for each question

The geological time scale is divided up and organized according to what life forms existed on earth. a. True b. False

Through what process does water enter the atmosphere from your body as you sweat

Mutations that hinder the survival of an organism

What is the predominant fiber type in the postural trunk muscles?

Human sperm cells and egg cells are A) haploid, each containing 23 chromosomes B) haploid, each containing 46 chromosomes C) diploid, each containing 23 chromosomes D) diploid, each containing 46 chromosomes

Produces gametes used in sexual reproduction