Which of these is an example of a hypothesis

A) observe a plant kept in the dark

B) wonder why plants grow well in sunlight

c) leaves may change color due to temperature

d) add different quantities of water to three potted plants

During the race the concentration of sugar in the athletes blood decreases

Environmental factors that increase or decrease genetic varaition

What adaptations inherited from our primate ancestors enable humans to make and use tools?

The War Powers Act of 1973 is an example of a A Congressional check of Presidential power B Presidential expansion of congressional power C Presidential check of congressional power D Congressional expansion of Presidential power

True or false: a neuron can release more than one kind of neurotransmitter. a. True b. False

Which of the following is NOT a layer of the skin? dermis epidermis endodermis basal cell layer

Evan washes his hands more than 50 times a day because of an ongoing fixation on germs; he is most likely suffering from

What factor can cause secondary succession?

Why are plant cell and animal cell difrent in shape?

You are a running in a race. What is one feedback mechanism that happens as you increase exercise and muscle activity? A) leg cramps B) longer steps C) increased heart rate D) decrease in body temperature