Which is true of archaeans?

a. they are extremophiles

b. they are the cause of many human diseases.

c. structurally, they represent an intermediate form between bacteria cells and eukaryotic cells.

d. they have undergone horizontal gene

e. they include earth's first aerobic photosynthesizers

E.They include Earth's first aerobic photosynthesizers

Hope this helped!!!

A

Explanation: archaens are classified as extremophiles

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).