How many species go extinct in an average day?

a. 3

b. 72

c. 1000

d. 20000

Good

Sam and Louise were in a house fire and only woke up when the firemen rushed in to see if anyone was in the house. They did not have a working fire alarm.

What is usually the origin of a non-standard amino acid residue found in a polypeptide chain?

How do animals obtain the nitrogen they use to make proteins and nucleic acids? a. by consuming plants or other animals b. by absorbing ammonia from bacteria growing in the roots of plants c. by breathing the nitrogen present in the atmosphere d.

In what form is carbon found in the biosphere

Three animals other than birds that build nests

Prokaryotes that belong to the kingdom Eubacteria and carry out photosynthesis are called

Which law states that each planet revolves so that an imaginary line connecting it to the sun sweeps over equal areas in equal time intervals?

Why do you think keeping salt water shellfish such as clams and mussels in freshwater kills them? support your answer?

Of All of the organisms living today, what percentage will eventually become fossils

What characteristics do scientists use when observing organisms and placing them in the six kingdoms