Which action is a physical change in digestion?

producing enzymes for nutrient absorption

absorbing nutrients from food

mashing food with teeth

salivating to break food into carbohydrates

What conditions of plate movement create divergent plate boundaries

The birds shown above have beaks with three different shapes and sizes. These genetic variations in the beak each appeared initially due to

10. Imagine that you are looking at two boats on land. One is a very small boat made out of heavy material, and the other is a large boat made out of light material. Explain which boat would be more likely to float.

In the results of the experiment in "the lowest animal," the cat does not deliberately terrify the mouse. it does not know the mouse is suffering. true or false

The random alignment of maternal and paternal homologous chromosomes during metaphase I is one of the ways genetic variability among gametes comes about.

The evolution of populations due to chance isa) genetic drift. b. has more effect in large populations than in small populations. c. gene flow. d. natural selection. e. genetic variation.

When you first get into the swimming pool the water feels rather cool; but after swimming for a while the water feels fine. a friend asks you how the water is and you tell her the "water's great".

What part of the brain is primarily responsible for monitoring blood glucose levels and causing chemical reactions to spur us to eat when glucose levels are low?

Which cell structure is responsible for controlling what enters the cell? select one: a. cytoplasm b. nuclear membrane c. plasma (cell) membrane d. endoplasmic reticulum

All of the following are functions of the peripheral nervous system except it interprets signals from the external environment it sends signals to the internal organs it receives messages from the central nervous system it sends messages directly to