A certain strain of bacteria used to be susceptible to penicillin. Today, that strain is resistant to penicillin. Which best explains this observation?
A. The bacteria needed to become resistant to survive.
B. The mutation rate in the bacteria population greatly increased.
C. The isolation of the strain caused it to become resistant.
D. A mutation occurred and was passed to future generations.

During sunny hours, a large amount of build up between the hours of 1: 00-5: 00 pm. a. ozone b. mercury c. lead d. sulfuric acid

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 a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

Identify any four organelles that should be present in the eukaryotic organism and describe the function of each organelle