Which of the following statements is true about external and internal fertilization?

a. external fertilization doesn’t require sexual intercoure

b. all animals that lay eggs use extra large fertilization

c. internal fertilization doesn’t require sexual intercourse

d. all animals that lay eggs use internal fertilization

Which of the following would most likely be key to gathering evidence that the rna world hypothesis is valid? creation of suitable environments for long-term study of single-celled organisms simulation of early earth conditions and long-term study of the resulting molecules development of a system for studying the microsphere's ability to absorb additional molecules categorization of the different specific conditions that result in the development of microspheres

When organisms are classified ,they are given a two part name

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen