<span>The lysosomes are membrane-enclosed organelle, usually spherical. They contain a number of hydrolytic enzymes that are able to break down dfferent kind of molecules. However, to maintain the optimal conditions for enzymes to perform their function, pH in the lysosomes must bi acidic and thus maintained between 4.5 and 5.0. Apart from hydrolytic enzymes, the lysosomes contain substances involved in cell signaling and energy metabolism. </span>
I would say physical though.
Answer:
<em>b. Branch</em>
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Explanation:
In a phylogenetic tree, used to show the evolutionary relationships among various biological species or other entities; their phylogeny, node is referred to as the taxonomic unit. From the node, the species branch out into the currently living population of interest, found at the tips of lines referred to as the tree's branches.
A because we’ve found more food and people are getting fat
