Which is the first part of the immune system to attack an invader?

O

A. B cells

B. Macrophages

O

O

C. Lysozymes

O

D. T cells

Secondary succession usually occurs much faster than primary succession. True or false?

What is one of the first things that is done when bones are discovered

How does the respiratory system work at the tissue level

How does the theory of evolution explain the diversity of life that exists today? Include Natural Selection

Stoplights have a taste that is preferred by gobblers. Suppose a mutation occurred in the gene for taste. The mutation resulted in offspring with a bitter taste that repels the gobblers. What would you expect to happen to that mutation over time?

Which of the following steps is an important part of the process by which ecology guides human to a sustainable future?

Estuaries are very productive ecosystems because they receive nutrients from rivers and oceans. a. True b. False

What is found about 10 km above earths surface

There is no fusion of gametes in this type of reproduction

This is any substance used in treating or alleviating the symptoms of a disease or injury.