In what era did modern man first appear?

What is an estuary? How and why does the salinity of estuaries vary?

What makes up the central nervous system?

You are a biologist examining local bird populations in your area. You have noted that there appears to be several varieties of bird species in the area.

Which of the following would be the best tool for looking at cells in a scientific investigation? A. a microscope B. a telescope C. a hand lens

Why do erythrocytes swell and burst when placed in water? (A) Since water concentration is higher outside the cell, water moves inward by passive diffusion.

How do fish nets effect the ocean's ecosystem?

A dog and a pig attempt to mate. we are aware that these are two different animal species. but what is the best explanation for the barrier that makes it impossible for them to successfully mate?

How do fossils and fossil record support the idea that life changes over time

1 reason why cases of violence and abuse are not reported

Question number 3 Site A is pavement. Site B is bare soil. Site C is a forest. Soil erosion caused by runoff will be greatest at Site be greatest at Site