Select 2 words that can be used to describe the diagram

a. niche

b. 10% rule

c. symbiosis

d. ecological succession

e. trophic levels

Choose the correct words to complete the sentences related to genetic screening. is a procedure that is used during pregnancy to detect genetic defects. is extracted from the uterus and used to identify genetic disorders?

Which of these is not a nucleotide base found in dna?

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic