The subject is science.

which of the following characteristics are true for both plants' and animals' reproduction? *
1 point
alternation of generation
they carry hereditary material from parent.
characterized by sexual reproduction
the offspring looks identical to its parents.
egg-laying land animals have evolved to produce eggs with tough shells to ensure that *
1 point
external fertilization can take place
the egg and the sperm can fuse.
parental care is unnecessary.
the developing embryo does not dry out.
a woman with a genetic disease marries a man who does not carry the disease. it is not possible for their children to have the disease. the disease must be *
1 point
recessive
caused by an extra chomosome
dominant
over time, a plant pollinated by a hummingbird has developed very long, tube-like flowers. why might the flower have adapted in this way? *
1 point
the longer, tube-shaped flowers probably developed to keep the hummingbird from reaching and drinking the flower’s nectar.
the longer, tube-shaped flowers probably developed so that the hummingbird must stick its head in the flower to drink the nectar.
the longer, tube-shaped flowers probably developed so that pollen would not fall into them as a hummingbird flies past.
the longer, tube-shaped flowers probably developed so that hummingbirds could land on them.
which of the following is an advantage that a farmer would see when using a genetically-engineered crop? *
1 point
introducing chemicals in the environment
increasing an animal’s resistance to antibiotics
increasing the amount of crop harvested
reducing the resistance of a crop to pesticide
which of the following is an example of inbreeding? *
1 point
a farmer chooses the cows in his or her herd that produce the most milk and breeds only those cows.
a farmer chooses the cows in his or her herd that produce the most milk and breeds them with cows that get sick less often.
a farmer chooses the cows in his or her herd that produce the most milk and injects them with hormones that make them produce more milk.
a woman gives birth to a son. what is the probability that her second child will be a girl? *
1 point
100 percent
25 percent
50 percent
0 percent
which of the following correctly identifies the sequence of stages of human development? *
1 point
embryo --> zygote --> fetus --> embryo
blastocyst --> embryo --> fetus --> zygote
zygote --> blastocyst --> embryo --> fetus
how do the cherries on a cherry tree the plant reproduce? *
1 point
cherries develop into seeds, which are young, undeveloped plants.
animals eat the cherries, which disperse the plant’s seeds.
pollen inside the cherries fertilizes ovules, which produce seeds.
cherries are carried away by the wind, which means the seeds do not have to compete for resources
the new cell that is formed from fertilization is called a(n) *
1 point
ovum
blastocyst
zygote
sperm