3
How does nature “select" phenotypes, such as
bird beaks? Check all correct explanations.
o Organisms can choose the genes that will
make them most successful.
The environment influences which alleles an
organism can pass on to its offspring.
Traits that suit the environment enable an
organism to reproduce in greater numbers.
Traits that do not suit an environment make it
harder for an organism to stay alive and
reproduce.

Blood, made up of red and white blood cells, work together to form

Which of the following describes a negative feedback loop? when the heart rate is too high, the body sends hormones that continually increase the heart rate higher. when a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones. when blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows. when a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.

What is the next step in muscle contraction after the actin changes shape? (apex)