Agroup of scientists is investigating the site of an ancient volcanic eruption. how can scientists determine whether more than one eruption occurred?

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that

People with one sickle cell allele are not likely to get malaria. what is this an example of?

Question 17 (1 point) where does penicillin come from? a. it is a chemical that man invented b. it is a fungus c. it is a toxin made by other bacteria d. it was discovered in archaebacteria