Lamarck's proposal of the inheritance of acquired characteristics included the idea that
a. species are fixed and unchanging over time.
b. organisms are acted on by the environment.
c. local catastrophes cause mass extinctions of species.
d. the continual stretching of giraffe's necks to reach leaves led to longer necks.

The answer is d. the continual stretching of giraffe's necks to reach leaves led to longer necks.

Explanation:

This statement was one of the main ideas of Lamarck's proposal inheritance. He thought that as giraffes needed to elongate their necks in order to reach the higher parts of the trees, then, the necks actually elongated. So the need was prior to the mutation. We now know that mutations happen before the change in the whole population.

answer:   option a) glucagon was secreted by his pancreas before he ate the cookies because blood glucose was low. insulin was secreted after he ate the cookies because his blood glucose was high.

explanation:

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.