Please help will mark brainliest
Which of these are the correct base pairs in DNA ?

thymine and guanine

cytosine and guanine

cytosine and adenine

adenine and uracil

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

Sperm pass through the and connect to a short ejaculatory duct. vas deferens prostrates seminiferous tubules none of the above