What does biodiversity describe?

a) the number of species on Earth

b) the number of individual organisms on Earth

c) the number of populations on Earth

d) the number of communities on Earth

What human activities lead to soil erosion?

How do scientists know that the first organisms were simple, unicellular organisms

Look at the graph to answer the questions about genetically engineered crops. What percentage of acres were devoted to HT corn in 1999? What percentage of acres were devoted to HT soybeans in 2005?

What are the environmental pressures for a frog?

Describe some of the factors that have contributed to the success of seed plants

Define alternation of generations

virus important environmental role

What are alleles? A. the decoders of the DNA message B. two forms of single genes C. the basic unit of inheritance D. a measurable factor

Ecoribi is a common Used to cut dna cloning

Which statement accurately describes the levels of organization? A group of cells that work together to perform a common function is called an organ. A group of tissues that work together to perform a common function is called an organ.