Which substances are contained in saliva and tears to break down pathogens?

a

enzymes

b

oils

c

acids

d

sweat

1. Nucleus is called the master of cell. why?

Why do cells need to be able to transport things across their membranes

Abi measures the volume and weight of four objects and records his data in this table. Which object has the most mass? W X Y Z

Which of these is an environmental change that occurs rapidly? A - Regrowth after flooding B - Human population growth C - Hurricane D - Ecosystem changing from a meadow to pond

Scientists at the tar pits discovered that many of smaller animals they extracted from the pits still exist around los angeles today. But many larger mammals such as woolly mammoths and saber toothed tigers are now extinct.

The process of sediments being compacted and cemented to form sedimentary rocks is called A. metamorphism. B. deposition C. crystallization D. lithification

What is presumptive identification of a microorganism?

Which statement best describes the climate of a city? Select one: The average annual temperature of Austin, TX is 68.5°E San Antonio, Texas had a high temperature of 102°F today. Dallas, Texas had 8.6 centimeters of rain today.

A food manufacturer performs a study on their new brand of cereal. In the study, the food manufacturer compares their brand of cereal to two other brands in terms of vitamin and mineral content.

What tree disease was spread to North America by a fungus carried on insects embedded on wood imported from northern Europe?