2 02
Human reactions are a response to an external change.
02
Reflex actions help to protect the body against damage.
Figure 2 shows the nervous pathway for a reflex action.
Figure 2
Hot pan
Muscle in arm
A stimulus from the hot pan will cause the muscle in the arm to contract and move the
finger away.
Describe how the stimulus from the hot pan reaches the muscle in the arm.
[4 marks]​

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

In 2015, about ten percent of total u.s. energy consumption was from renewable energy sources. renewable energy plays an important role in reducing greenhouse gas emissions. when renewable energy sources are used, the demand for fossil fuels is reduced. sanjay and his family want to cut back on their use of non-renewable resources at home. they are thinking of an alternate way to heat their home without adding more greenhouse gases or pollutants to the environment. which renewable resource would not fit into their plan? a) solar power b) burning wood c) constructing a wind turbine eliminate d) generating hydroelectric power

Why did mendel use pea plants in his experiments? a. they have no alleles. b. they are haploid organisms. c. they reproduce quickly. d. they are all male.