50Pts. Will give Brainliest if correct.

What percent of all the genes in E. coli are active all the time?

10%

20%

60%

80%

Does pumice have large crystals

Bordetella pertussis causes whooping cough by A) irritating the diaphragm, which leads to severe coughing attacks. B) forming a pseudomembrane that obstructs the respiratory passages.

Reptiles are closely related to birds. Which of the following characteristics do birds and reptiles share? A. They both form amniotic eggs that are covered by a protective shell. B. They both live their entire lives on land. C.

In which ways can unequal power relations contribute to the spread of HIV infection

DDT is a pesticide that was banned because of its negative impact on the environment. DDT weakened eggshells and caused the decline of many bird species, including bald eagles.

This leaf is 4inches long what kind of observation is this

In which of these mitosis phases is the replication of dna accomplished?

An assemblage of local plants, animals, and insects covering a large area such as a tropical rainforest or a grassland is called a

When dust and ash particles block out sunlight and reduce solar radiation earth experiences the

Describe one piece of evidence that supports the idea that the present-day continents were once part of a larger continent, Pangaea, that split apart