How far back does the fossil record extend?

a. 1 billion years

b. 560 million years

c. 3 million years

d. 3.5 billion years

Explain what will happen if there are not enough resources to support the individuals in species,

Christa is now in her 43rd week of pregnancy. her unborn baby is considered to be

Why fossils are important and why sedimentary rocks have fossils?

What is the structure used in reproduction in pteridophytes? what is the structure used in reproduction in gymnsperms?

A farmer is raising rabbits. The average body weight in his population is 3kg. The farmer selects the 10 largest rabbits in the population, whose average body weight is 4kg, and interbreeds them.

How is a scientific hypothesis best evaluated?

The overall population of a species decreased. What could have occurred to make this happen? The immigration rate increased, while the death rate decreased. The birth rate decreased, while the death rate increased.

Which of the following terrestrial biomes cannot be found in the United States? A: temperature deciduous forest B: tundra C: desert D: grassland/prairie

Which of these food sources does the bald eagle not feed on? plants fish carrion mammals

what will happen to a base isolated building when seismic wave strike the building during an earthquake