As a consequence of red blood cells' lack of nuclei and other organelles, they ________
A) have more room to carry hemoglobin
B) have a small surface area
C) contain less hemoglobin than they might otherwise be able to carry
D) can carry more calcium
A
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Despite evidence to the contrary, many scientists during the mid-twentieth century remained convinced that ____________________ were the carrier of genetic information
Fill in the blank(s) with correct word
One of the symptoms of global warming is a decrease in the persistence of sea ice in the Arctic, which affects polar bears by:
a. increasing their access to salmon b. reducing the portion of the year that they can reach seals c. improving the chances of survival of their young d. increasing mercury contamination in their tissues and increasing their access to salmon e. increasing risk of stranding far from shore and reducing the portion of the year that they can reach seals
Which of the following statements regarding microbial changes in a developing fetus are true?
a. the uterus and its contents (baby and placenta) are sterile until vaginal delivery. b. microbes that promote the digestion of milk may be transferred to the baby through the placenta c. microbes that promote healthy skin in a newborn are transferred to the baby as it passes through the vagina d. microbes that promote the digestion of milk may be transferred to the baby as it passes through the vagina
Despite an abundance of habitat, why will it be difficult for the human species to recover?
A) Related humans are not able to reproduce. B) The founder effect will slowly kill off the survivors in a small population. C) Modern humans lack the ingenuity needed to survive without an extended social network. D) The reduced genetic diversity will make it difficult for the population to adapt to new diseases or other environmental changes.