Which of the following animal phyla are most closely related?
A) Porifera and Cnidaria B) Echinodermata and Chordata
C) Arthropoda and Annelida D) Platyhelminthes and Nematoda
Answer: B
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The veins of leaves are used for
a. support. b. identification. c. transport of water and nutrients. d. detachment in the autumn. e. regeneration.
About 75%-95% of living cells, both plant and animal, is composed of ________
Fill in the blank(s) with correct word
Why is DNA replication essential for a cell?
a. An organism must copy its DNA to pass genetic information to its offspring. b. All organisms require two copies of DNA. c. It allows the organism to repair any mistakes. d. Because DNA is double-stranded.
When blood sugar levels are running low, the body would produce more:
A) insulin than glucagon. B) insulin than cortisol. C) insulin than adrenaline. D) glycogen than insulin. E) glucagon than insulin.